This document covers procedures for deploying, configuring, and managing Sentinel VoLTE:

Tip Read this document in conjunction with the Sentinel VoLTE Architecture document and see the Sentinel AGW Guide.

Features

This page presents summaries and links to more detailed descriptions of features installed with the Sentinel VoLTE product.

SIP features

The SIP features can be thought of as building blocks for any SIP-AS functionality, regardless of whether it is MMTel-AS, SCC-AS or any other SIP-AS.

General VoLTE features

The General VoLTE Features are used by both the MMTel-AS and SCC-AS functionality of the Sentinel VoLTE product. They can be thought of as building blocks for MMTel-AS and SCC-AS.

MMTel features

The MMTel Features implement MMTel-AS functionality.

SCC features

The SCC Features implement SCC-AS functionality.

Third Party Registration features

The Third Party Registration features implement the necessary Third Party Registration functionality for the MMTel-AS and SCC-AS.

CAMEL features

The CAMEL features can be thought of as building blocks for SCP functionality.

General features

The General Features are essentially utility features that are installed out-of-the-box.

The Sentinel VoLTE product does not use the Subscriber Data Lookup and Subscriber Validity features as the General VoLTE features are used instead. These features may be used when customising Sentinel VoLTE.

SIP features

The SIP Features are not specific to SCC or MMTel or even VoLTE installations. They are installed out-of-the-box with Sentinel VoLTE.

General VoLTE Features

These features are neither MMTel specific nor SCC specific.

Feature What it does

DetermineChargeMode

uses information from the incoming INVITE request to determine whether Ro Online charging should be applied to the session,

DetermineInitialLegNames

uses the Leg Manager to get the names of the original SIP legs established during call set up, and saves the values

Determine International and Roaming Status

determines if the SIP session is roaming and if it represents an international, or international ex HC call, based on the location of the calling party and the destination address

DetermineVoltePlanId

uses information from an incoming INVITE, MESSAGE or SUBSCRIBE request, and from session state to set the plan ID in the Sentinel selection key

DialPlanEnforcement

analyses the request-uri of an originating trigger to determine if the dialed digits match the dial plan

IMSIDLookup

reads Third Party Registration information stored in the HSS as Transparent Data, and writes it into session state.

IMSIDLookupFromCassandraSIP

reads Third Party Registration information stored in the Cassandra Database, and writes it into session state.

IMSIDLookupFromCassandraIN

reads Third Party Registration information stored in the Cassandra Database, and writes it into session state.

IMSUserStateLookupFromHSS

reads the IMS user state from the HSS, and updates session state.

InternationalCallManagement

This feature is responsible for playing an announcement when a subscriber is making an international call. It can also bar an international call (with an optional announcement) if the subscriber does not dial a number in the international format or with an international escape code.

SubscriberDataLookupFromHSS

is responsible for reading data from the HSS and writing it into Sentinel session state fields.

SubscriberDataLookupFromHLR

is responsible for reading subscriber data from the HLR and writing it into Sentinel session state variable fields.

VolteSipAvpCdr

is responsible for building a Call Detail Record that reflects the actions taken whilst processing a session.

VolteNetworkKPI

The VoLTE Network KPI feature (VolteNetworkKPI) increments the "Call Success" and "Post Dial Delay" counters, which you can combine with other stats to gauge network traffic.

SuppressSdpCdr

is a system feature which prevents SDP-change initiated CDRs from being written by the VolteInterimCdr feature for non-roaming Mobile Terminating calls.

VolteInterimCdr

is a system feature that is responsible for writing interim Call Detail Records and/or Diameter Accounting Requests (ACRs) throughout the session.

FeatureCapsManagement

sets values for the Feature-Caps header on outgoing messages based on data from the session’s FeatureCapsManager

SetOcsAnnouncementID

schedules configurable announcements to the subscriber based on Credit-Control-Answers

DetectHoldResume

updates session state when a session’s held status changes

AccessLegTracking

This feature gathers the information required to allow the session tracking system to be used for access transfer procedures.

FetchIMCSI

retrieves CAMEL Subscription Information (CSI) from the HLR for charging purposes

CapLocationHeaders

adds proprietary SIP headers to outbound INVITE requests to allow CAP charging of the session.

VolteLoadServiceConfig

loads service configuration out of a profile and into session state.

StripPreconditions

optionally strips preconditions information from initial INVITEs

Access Leg Tracking

This feature gathers the information required to allow the session tracking system to be used for access transfer procedures.

Feature Cheat Sheet

Feature Script Name

AccessLegTracking

MMTel or SCC

Both

Call-Type

All

Session Plan

MMTel, SCC, SCC-Term-Anchor

Execution Point

SipAccess_SubscriberCheck, SipAccess_PartyResponse, SipAccess_PartyRequest, SipMidSession_PartyRequest, SipMidSession_PartyResponse

Network Operator Config

None

Subscriber Config

None

POJO or SBB

POJO

Feature FSMs

None

Feature Parameters

None

SAS Support

No

Related features

ExternalSessionTracking

Feature Statistics

AccessLegTracking statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set:
SLEE-Usage → sentinel.volte.sip service ID → sentinel.volte.sip SBB ID → feature.DetermineSessionReplication

Name Type Description 
Started

Counter

Incremented when the feature is triggered.

 
FailedToStart

Counter

Incremented when the feature fails to start.

 
FailedDuringExecution

Counter

Incremented when the feature fails while executing.

 
IssuedWarning

Counter

Incremented when the feature issues a warning.

 
TimedOut

Counter

Incremented when the feature times out during execution.

 
TrackingDataOnInitialInvite

Counter

Incremented when the feature updates tracked data due to an initial INVITE.

 
TrackingDataOnProvisionalResponse

Counter

Incremented when the feature updates tracked data due to a provisional response to the initial INVITE.

 
TrackingDataOnAck

Counter

Incremented when the feature updates tracked data due to the ACK for the initial INVITE.

 
TrackingDataOnHoldStatusChange

Counter

Incremented when the feature updates tracked data due to a change in the hold status of a session.

Behaviour

This feature uses the Sentinel SIP Leg API to provide information to the ExternalSessionTracking feature. This allows the Session Ownership Facility to be used for tracking sessions for the purposes of access transfer.

The feature passes through four phases during session processing. Each phase is associated with a particular point in the session plan. At each phase the feature updates different sets of data.

Tracked Data

There are several sets of data that the feature maintains in the session tracking system. Different sets are updated at different times based on where in the session plan the feature is running. The data sets are:

  • Basic Tracking Data

  • Call Setup Data

  • Media State Data

The following sections outline each piece of information that is handled by this feature, and which of the above sets each belongs to.

Tracking Enabled
Data Set Leg API Field

Basic Tracking Data

 
TrackingEnabled

Flags a leg for tracking be the External Session Tracking feature. The Access Leg Tracking feature will set it to true for all access legs.

WaitForTrackingResultEnabled
Data Set Leg API Field

Basic Tracking Data

 
WaitForTrackingResultEnabled

Flag that indicates to the External Session Tracking feature that it should wait for the result of any session ownership facility operations relating to this leg before allowing the session to proceed. The Access Leg Tracking feature will set this flag to true for all access legs. This is done to ensure access transfer is prepared to run before the session is allowed to continue.

Owner
Data Set Leg API Field

Basic Tracking Data

 
Owner

URI of the node that currently owns the session. The feature will always ensure this matches the URI of the node it’s running on.

Additional Tracking Keys
Data Set Leg API Field

Basic Tracking Data

 
AdditionalTrackingKeys

These are alternative keys (i.e. keys besides the leg’s dialog ID) that can be used to retrieve tracking data for a leg. The feature retrieves these keys from the AccessLegTrackingKeys session state field. The keys present in this session state field are set by various VoLTE features that make use of access leg tracking.

Dialog State
Data Set Leg API Field

Basic Tracking Data

 
AdditionalTrackedAttributes (with attribute key: dialog-state)

This field describes the current state of the leg. The current dialog state is determined first by how far through call setup the leg is, and once call setup is complete, by whether the call is held or not (as determined by the Detect Hold Resume feature). The field will have one of the following values:

  • PARTIAL_DIALOG

  • PRE_ALERTING

  • ALERTING

  • ACTIVE

  • HELD

Media Feature Tags
Data Set Leg API Field

Call Setup Data

 
AdditionalTrackedAttributes (with attribute key: media-feature-tags)

These are the media feature tags that have been seen on this session. They are retrieved from the contact header of the initial INVITE for originating access legs, and the initial INVITE response for terminating access legs.

Associated Dialog ID
Data Set Leg API Field

Call Setup Data

 
AdditionalTrackedAttributes (with attribute key: associated-dialog)

This is the dialog ID of the leg currently linked to the access leg.

Last Active Time
Data Set Leg API Field

Media State Data

 
AdditionalTrackedAttributes (with attribute key: last-active-time)

This is the timestamp for the last time the session entered the active state (i.e. the time the ACK was received, or the last time the call was resumed after being held).

Last Held Time
Data Set Leg API Field

Media State Data

 
AdditionalTrackedAttributes (with attribute key: last-held-time)

This is the timestamp for the last time the session entered the held state.

Committed SDP
Data Set Leg API Field

Media State Data

 
AdditionalTrackedAttributes (with attribute key: committed-sdp)

This is the current negotiated SDP in use on the access leg.

Committed SDP Timestamp
Data Set Leg API Field

Media State Data

 
AdditionalTrackedAttributes (with attribute key: committed-sdp-timestamp)

This is the time at which the current committed SDP on the access leg was accepted.

Feature Phases

The four phases the feature passes through are:

  • Initial Request Processing

  • INVITE Response Processing

  • ACK Processing

  • Mid-Session Message Processing

Once any type of access transfer has been executed on a session, this feature will no longer attempt to maintain access leg information, and will always end without executing any phase.

Initial Request Processing

Execution Point: SipAccess_SubscriberCheck

This phase is only executed on originating AS instances, and only on the initial INVITE request. This means that the access leg will always be the leg the INVITE was received on, and there will never be any forked access legs.

The feature will skip this phase if the PartialDialogAccessLegTrackingActive session state field is false. This session state field is set by the SCCDetermineExternalSessionTracking feature, based on the presence of a g.3gpp.ps2cs-srvcc-orig-pre-alerting media feature tag on the INVITE request.

In this phase:

  • The feature will record the media-feature tags present on the initial INVITE.

  • The feature will set the dialog state to PARTIAL_DIALOG.

  • Basic Tracking Data will be updated.

  • Call Setup Data will be updated.

INVITE Response Processing

Execution Point: SipAccess_PartyResponse

This phase is executed when the feature receives a provisional response for the initial INVITE request. On terminating AS instances the leg the response is received on is the access leg, and on originating AS instances the leg the response will be forwarded on is the access leg. The access leg may be forked during this phase, so multiple legs could be tracked in a single session at this time.

In this phase:

  • The feature will record the media-feature tags present on the response if the AS is a terminating instance.

  • The feature will set the dialog state to PRE_ALERTING or ALERTING based on whether a 180 Ringing response has been received.

  • Basic Tracking Data will be updated.

  • Call Setup Data will be updated.

ACK Processing

Execution Point: SipAccess_PartyRequest

This phase is executed when the feature receives a ACK request for the initial INVITE 2xx response. On originating AS instances the leg the ACK is received on is the access leg, and on terminating AS instances the leg the ACK will be forwarded on is the access leg. Any forked access legs will have ended by the time this message is received, so there will only be one access leg in this phase. The ExternalSessionTracking feature will have automatically cleaned up tracked data for these forks.

In this phase:

  • The feature will record the last active time for the call as now.

  • The feature will set the dialog state to HELD (very unlikely) or ACTIVE based on the hold status of the call.

  • Basic Tracking Data will be updated.

  • Call Setup Data will be updated.

  • Media State Data will be updated.

Mid-Session Message Processing

Execution Points: SipMidSession_PartyRequest and SipMidSession_PartyResponse

This phase is executed on receipt of any message after call setup that results in a change to the hold status of the call. The access leg is determined by looking up its name from the CurrentLocalLegName session state field.

In this phase:

  • The feature will set the dialog state to HELD or ACTIVE based on the hold status of the call.

  • Basic Tracking Data will be updated.

  • Media State Data will be updated.

VoLTE Load Service Config

This feature loads service configuration out of a profile and into session state.

Feature Cheat Sheet

Feature Script Name

VolteLoadServiceConfig

MMTel or SCC

Both

Call-Type

All

Session Plan

All

Execution Point

SipAccess_SessionAccept (SIP), DirectAccess_SessionAccept (SS7)

Network Operator Config

Yes

Subscriber Config

None

POJO or SBB

POJO

Feature FSMs

None

Feature Parameters

None

SAS Support

No

Feature Statistics

VolteLoadServiceConfig statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set:
SLEE-Usage → sentinel.volte.sip service ID → sentinel.volte.sip SBB ID → feature.VolteLoadServiceConfig

Name Type Description

Started

Counter

Incremented when the feature is triggered.

FailedToStart

Counter

Incremented when the feature fails to start.

FailedDuringExecution

Counter

Incremented when the feature fails while executing.

IssuedWarning

Counter

Incremented when the feature issues a warning.

TimedOut

Counter

Incremented when the feature times out during execution.

ConfigLoaded

Counter

Incremented when the feature successfully loads configuration data into session state.

Session Input Variables

Variable name Type Comments

SentinelSelectionKey

SentinelSelectionKey

Used to select which profile to load from the configuration table.

Session Output Variables

Variable name Type Comments

UseHLRBasedCSRN

boolean

Determines whether the service will attempt to generate a CSRN from HLR data when required (using MSRN for GSM networks or TLDN for CDMA networks).

RetrieveHLRRoamingStatus

boolean

Determines whether the service will attempt to determine the subscriber’s roaming status from the HLR when required.

RegistrationDataSource

RegistrationDataSource (enum)

Determines where the service will attempt to retrieve third party registration data from. Possible values are HSS and CASSANDRA.

SubscriberDataSource

SubscriberDataSource (enum)

Determines where the service will attempt to retrieve subscriber data from. Possible values are HSS and HLR.

Configuration

Network configuration is stored in a profile table named VolteServiceConfigProfileTable. Profiles in this table are scoped on Sentinel Selection Key.

Warning Directly modifying values in this profile is not recommended, they should instead be set through the Sentinel VoLTE installer.
Attribute Type Default Value Description

UseHLRBasedCSRN

boolean

false

Determines whether the service will attempt to generate a CSRN from HLR data when required (using MSRN for GSM networks or TLDN for CDMA networks).

RetrieveHLRRoamingStatus

boolean

false

Determines whether the service will attempt to determine the subscriber’s roaming status from the HLR when required.

RegistrationDataSource

RegistrationDataSource (enum)

CASSANDRA

Determines where the service will attempt to retrieve third party registration data from. Possible values are HSS and CASSANDRA.

SubscriberDataSource

SubscriberDataSource (enum)

HSS

Determines where the service will attempt to retrieve subscriber data from. Possible values are HSS and HLR.

Behaviour

When triggered this feature will attempt to retrieve a profile from the VolteServiceConfigProfileTable using the current Sentinel Selection Key. If it successfully finds a profile it will copy each attribute on the profile into its corresponding session state field. If it fails to find a profile it will raise a configuration error.

DetectHoldResume

This feature updates session state when a session’s held status changes .

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO or SBB Feature Other notes

SCC

No

Both Originating and Terminating

 
SIP Mid Session Party Request,
SIP Mid Session Party Response

None

None

Stateless

POJO

Session input and output variables

Session input variables

None.

Session output variables

Session State variable name Type Comments 
HeldStatusChanged

Boolean

Indicates that the current message has changed the held status of the session.

 
SessionIsHeld

Boolean

Indicates whether the session is currently on hold.

 
LastActiveTime

Long

The time that the session last changed from held to active.

 
LastHeldTime

Long

The time that the session last changed from active to held.

Statistics

DetectHoldResume statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → DetectHoldResume
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.DetectHoldResume"

Name Description 
Started

Incremented each time the feature runs

 
FailedToStart

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Incremented when a fatal error occurs during feature execution

 
TimedOut

Incremented when feature execution does not complete within a reasonable time frame

 
DetectSessionHold

Incremented when the feature detects a transition from active to held

 
DetectSessionResume

Incremented when the feature detects a transition from held to active

Behaviour

The DetectHoldResume feature updates session state when the session’s held status changes.

The feature runs on the SIP Mid-Session Party Request and SIP Mid-Session Party Response execution points. If a message containing an SDP offer arrives, the SDP is compared to the session’s previous SDP.

The feature looks for changes in directionality attribute in the session description, for example a=sendrecv or a=sendonly, to determine if the session is being put on hold or resumed. If the held status has changed, session state is updated with the new held status.

CapLocationHeaders

The CapLocationHeaders feature adds proprietary SIP headers to outbound INVITE requests to allow CAP charging of the session.

The OC-Charging-GT header contains the location of the subscriber to allow roaming to be correctly charged.

The OC-IM-TDP header contains the location of the SCP that IM-SSF should send charging requests to.

The OC-Replication-Information header contains instructions on how the IM-SSF should handle session tracking and replication.

Feature cheat sheet

Feature Script Name

CapLocationHeaders

MMTel or SCC

Both

Call-Type

Orig or Term

Session Plan

mmtel-orig, scc-tads-only

Execution Points

SipAccess_SubscriberCheck

Network Operator Config

Yes

Subscriber Config

No

POJO or SBB

POJO

Feature FSMs

None

Feature Parameters

None

SAS Support

Yes

RA Entity Links

None

Prerequisite features

Network Operator Data

The CapLocationHeaders feature depends on configuration in the CapChargingConfigProfileTable to specify how to generate the OC-Charging-GT header.

It also reads the RefreshPeriod in the SessionRefresh configuration profile table to determine the refresh period to include on the OC-Replication-Information header when replication is enabled.

CapChargingConfigProfileTable

Configuration is stored on a profile table called CapChargingConfigProfileTable.

Data is scoped according to a Sentinel selection key.

Attribute Name Type Default Description 
ChargingGTFormatString

String

null

The format template to use when creating Charging GTs. It must be a digit string except for tokens ('{iso}', '{mcc}', '{mnc}) which are substituted in.

 
UnknownLocationChargingGT

String

null

The Charging GT to use when one could not be generated because the user’s location could not be determined.

 
OnlyChargeTerminatingCallsIfInternationalRoaming

boolean

false

When true, terminating calls will only be charged if the served user is roaming outside of their home country.

Session Input Variables

Variable name Type Comments

ChargeMode

Enum

The feature will only run if the charge mode is CAP.

SentinelSelectionKey

SentinelSelectionKey

Affects which profiles are loaded from each configuration table.

CallType

Enum

Affects whether CAP headers are added and what values are used for them.

RoamingStatus

Enum

If the call is terminating and not roaming, no headers are added.

VLRNumber

AddressString

If the call is CS terminating then the VLRNumber is used for the OC-Charging-GT.

VMSCAddress

AddressString

If the call is CS terminating and there is no VLRNumber available then the VMSCAddress is used for the OC-Charging-GT.

OcImTdpHeader

String

The value to use for the OC-IM-TDP header.

IsoCountryCode

String

The ISO country code that the subscriber is registered with. It is used for formatting the OC-Charging-GT header.

PaniMccMncs

List<MccMnc>

The MCCs and MNCs that the subscriber is registered with. They are used for formatting the OC-Charging-GT header.

SessionUACLegReplicationTrigger

Enum

Used to determine if replication should be indicated as enabled on the OC-Replication-Information header.

SessionUASLegReplicationTrigger

Enum

Used to determine if replication should be indicated as enabled on the OC-Replication-Information header.

Statistics

CapLocationHeaders statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → CapLocationHeaders
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.CapLocationHeaders"

Statistic

Type

Description

 
Started

Counter

Incremented when the feature is invoked.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
CapLocationHeadersNotRequired

Counter

Incremented when the feature determines that no CAP location headers need to be added.

 
UsedVlrNumber

Counter

Incremented when the VLR number is used for the OC-Charging-GT header.

 
UsedVmscNumber

Counter

Incremented when the VMSC address is used for the OC-Charging-GT header.

 
NoVlrOrVmscNumberFound

Counter

Incremented when no VLR number and no VMSC address could be found.

 
UsedGeneratedChargingGT

Counter

Incremented when a generated Charging GT is used for the OC-Charging-GT header.

 
UsedUnknownLocationChargingGT

Counter

Incremented when the unknown location Charging GT is used for the OC-Charging-GT header.

 
SetOCIMTDP

Counter

Incremented when an OC-IM-TDP header is set on an outgoing request.

 
SetOCChargingGT

Counter

Incremented when an OC-Charging-GT header is set on an outgoing request.

 
SetOCReplicationInformation

Counter

Incremented when an OC-Replication-Information header is set on an outgoing request.

Installation

CapLocationHeaders is a GSM only feature and as such will only be deployed if GSM mode is selected in the installer.

Behaviour

The behaviour varies depending on whether the call is terminating or not.

Originating Behaviour

The feature attempts to generate a Charging GT using the ChargingGTFormatString and sets the OC-Charging-GT with this. If this fails, the feature uses the UnknownLocationChargingGT for the OC-Charging-GT header.

The feature sets the OC-IM-TDP header to the value stored in session state by the FetchIMCSI feature.

The feature sets the OC-Replication-Information as described below in the Replication Information section.

Terminating Behaviour

If the subscriber is not roaming the feature will check the OnlyChargeTerminatingCallsIfInternationalRoaming configuration value to determine whether it should do anything.

If the call is forked then the following occurs for each outgoing forked leg.

If the outgoing leg is CS then the feature attempts to set the OC-Charging-GT to the VLR Number retrieved by FetchMSRN. If there is no VLR Number in session state, the feature attempts to set the OC-Charging-GT to the VMSC address. If that is not present in session state either then the feature returns.

If the outgoing leg is PS then the feature attempts to generate a Charging GT using the ChargingGTFormatString and sets the OC-Charging-GT with this. If this fails, the feature uses the UnknownLocationChargingGT for the OC-Charging-GT header.

The feature sets the OC-IM-TDP header to the value stored in session state by the FetchIMCSI feature.

The feature sets the OC-Replication-Information as described below in the Replication Information section.

Generating Charging GTs

The feature uses the CAP Charging Component to generate Charging GTs based on location data.

Replication Information

The feature includes an OC-Replication-Information header on the request towards the IM-SSF which indicates whether replication behaviour is required.

The header value is determined based on the values of the SessionUASLegReplicationTrigger and SessionUACLegReplicationTrigger session input fields. If either of the fields indicated DISABLED then the the header value will be set to disabled, otherwise it will be set ot enabled.

When the header value is set to enabled, a refreshPeriod parameter will be added as well. This parameter is used to determine the TTL value the IM-SSF should use for session ownership records when doing session tracking. It is set equal to the value of the RefreshPeriod field in the SessionRefresh configuration profile table.

Determine International and Roaming Status

This feature determines if the SIP session is roaming and if it represents an international, or international ex HC call, based on the location of the calling party and the destination address .

The results of this feature are applied by the VoLTE communication barring features (MMTelOCB and MMTelICB), and also by the InternationalCallManagement feature

From the spec

Here’s what 3GPP 24.611 says:

international: This condition evaluates to true when the request URI of the outgoing SIP request:

  • corresponds to a telephone number, i.e. a SIP URI with a “user” URI parameter set to “phone” or a tel URI; and

  • does not point to a destination served by a network within the country where the originating user is located when initiating the call.

international-exHC: This condition for international barring, excluding the home country, evaluates to true when the request URI of the outgoing SIP request:

  • corresponds to a telephone number, i.e. a SIP URI with a “user” URI parameter set to “phone” or a tel URI;

  • does not point to a destination served by a network within the country where the originating user is located when initiating the call; and

  • does not point to a destination served within the served users home network.

Feature cheat sheet

Feature Script Name

DetermineInternationalAndRoamingStatus

MMTel or SCC

Both

Call-Type

Orig or Term

Session Plan

mmtel-orig, mmtel-term, scc-tads-only

Execution Points

SipAccess_SessionCheck or SipAccess_SubscriberCheck

Network Operator Config

Yes

Subscriber Config

No

POJO or SBB

POJO

Feature FSMs

None

Feature Parameters

None

SAS Support

Yes

RA Entity Links

None

Prerequisite features

Sentinel-SIP:

  • SIP Determine Network Operator

  • SND:Determine Call Type Feature

  • SIP Extract Network Info

  • SIP Normalization (recommended)

VoLTE:

Configuration

Configuration for this feature is in the DetermineInternationalAndRoamingStatusConfigProfileTable. The profiles within this table have the following fields:

Parameter Type Description

EndCallIfNoVisitedNetwork

Boolean

Decide if the feature will end the call if no Visited Network can be determined.

ForceUserEqualsPhone

Boolean

Explicitly add user=phone parameter and value to SIP URI during inspection.

MinLength

int

The minimum length of address that will be checked.

NonInternationalFormatDNIsNational

Boolean

Whether non international format DNs, i.e. with no leading "+", should always be treated as national.

UseMCCSpecificAddressListTables

Boolean

Use a prefix address list table for the subscribers Mobile Country Code.

The feature will also query the Sentinel SIP Configuration profile to retrieve the home network ISO country code.

Behaviour

Get the address string to use in address analysis

The DetermineInternationalAndRoamingStatus feature analyses a digit string that corresponds to the destination (or called) party. Digit strings may be in a Tel URL, or the user part of a SIP URI.

If the number retrieved from the Tel URI or SIP URI user part contains a + sign, the + sign is removed to leave just the digits.

The DetermineInternationalAndRoamingStatus feature uses different properties of the initial INVITE request for originating and terminating treatment:

  • If the session is originating, then it checks the request-uri and To address.

  • If the session is terminating, then it checks the P-Asserted-Identity address, the From address, and the Referred-By address.

Otherwise, the feature execution ends.

If a digit string is not found, then the feature will respond to the sentinel-core with featureCannotStart, and end.

Determine if address international and roaming status should be skipped

The DetermineInternationalAndRoamingStatus feature may decide to not handle the address if either:

  • The address is shorter than the configured MinLength defined in DetermineInternationalAndRoamingStatusConfigProfileTable

  • The address matches an entry in the SkipDIRSAddressList

This allows for short codes and specific longer length numbers to avoid DetermineInternationalAndRoamingStatus. The SkipDIRSAddressList is a configurable address list scoped by the Sentinel selection key; it is only given to the component when used by the SIP normalization component.

The format of the SkipDIRSAddressList is described by a standard address list configuration table. See Address List Configuration Profile for more information. The SkipDIRSAddressList configuration is found in its profile within ${PLATFORM_OPERATOR_NAME}_Sentinel_AddressListConfigurationTable.

Get the visited Mobile Country Code and Mobile Network Code

The prerequisite Extract Network Info Feature attempts to parse the P-Access-Network-Info and P-Visited-Network-Identifier headers to obtain the visited MCC and MNCs, and stores them in session state. The feature first checks if the session state field PaniMccsMncs (obtained from P-Access-Network-Info) contains any entries. If so, it takes the first entries for both the MCC and MNC. Otherwise, the visited MCC and MNCs are retrieved from the session state field PvniMccMnc, obtained by parsing the P-Visited-Network-Identifier according to IETF RFC 3455.

Get the visited network ISO country code

The ISO country code is determined by the ExtractNetworkInfo or DetermineLocationFromMSRN feature. It is stored in session state in the IsoCountryCode field. The feature will attempt to retrieve it from this field.

Get the visited-network-id for the served user

The feature first checks if the session state field IMSInformation contains a valid IMS Visited Network Identifier populated by Diameter Per Leg Info Feature.

If no value is present, it extracts the visited network id for the served user as follows:

  • If the session is originating, the P-Visited-Network-Id header is checked in the incoming request.

    • If this header exists, then the visited network id is set to the header value.

  • If the session is terminating, the OC-Term-P-Visited-Network-Id header is checked in the incoming request.

    • If this header exists, then the visited network id is set to the header value.

If the incoming request did not contain the visited network id, and if the served user is logged into the IMS, then Third Party Registration Data is consulted - to find the P-Visited-Network-Id at the time of IMS registration. Third Party Registration data is looked up with an access key of the default public identity for the served user. It is accessed via the Sh Cache Microservice.

If a visited network id cannot be determined, the feature checks the configuration in the DetermineInternationalAndRoamingStatusConfigProfileTable to determine if the call should proceed or not. If EndCallIfNoVisitedNetwork is false, then the feature exits without modifying session state. If EndCallIfNoVisitedNetwork is true then the call is terminated.

Get the prefix address list

An important part of this feature is an address list of prefixes for each MCC or each visited network. Each entry in the list states whether an address with this prefix, for a subscriber of the network operator, registered with a subscriber location network, represents a visited or home network.

The addresses in the list will be used to determine the international status based on the MCC. For originating calls the called party address is used to find the destination MCC, and for terminating calls the calling party address is used to define the MCC from the originating party. This list allows the operator to define how the international status will be resolved by setting the field isVisitedNetwork.

For a session processed by VoLTE:

  • The session is scoped to the network operator by the SIP Determine Network Operator feature (this is the subscriber’s home).

  • The MCC or visited-network-id is found as described above.

  • In addition to a DEFAULT entry, it is possible to add entries for any MCC or visited network in the DetermineInternationalAndRoamingStatus_AddressListConfigurationTable profile. There is an address list of prefixes stored in the DetermineInternationalAndRoamingStatus_AddressListEntryTable for both DEFAULT and each MCC or visited network stored in the DetermineInternationalAndRoamingStatus_AddressListConfigurationTable profile. Both tables are scoped to the Network operator.

The DetermineInternationalAndRoamingStatus_AddressListConfigurationTable is a standard address list configuration table, see Address List Configuration Profile for more information.

The DetermineInternationalAndRoamingStatus_AddressListEntryTable profile format is outlined by the following:

Parameter Type Description

Description

String

Address

String

The prefix address this address list entry is for — a sequence of characters matching: 0 … 9, a … f, A … F, #, *, .

ListId

String

The list id is a string that identifies the address list this entry belongs to. It has the following form: <selectionkey>:<schemaName>:<listname>

CountryName

String

Name of the country for where the subscriber is located.

ISOCountryCode

String

The ISO country code for the subscriber’s location.

MCCs

String[]

The list of MCCs for this prefix.

HomeNetwork

boolean

Is true if and only if this prefix represents a home network.

VisitedNetwork

boolean

Is true if and only if this prefix represents a visited network.

The prefix address list to use is now determined as follows:

  • If an MCC was found and the profile field useMCCSpecificAddressListTables is set to false:

    1. The feature will first attempt to use the default prefix address list named DEFAULT.

    2. If the default list could not be found, the feature attempts to use the prefix address list for the visited-network-id.

  • If an MCC was found and the profile field useMCCSpecificAddressListTables is set to true:

    1. The feature will first attempt to use the prefix address list for the specific MCC.

    2. If the prefix address list for the MCC could not be found, the feature attempts to use the prefix address list for the visited-network-id.

  • If an MCC could not be found:

    1. The feature will use the prefix address list for the visited-network-id.

If no prefix address list is found, the feature will respond to the sentinel-core with featureFailedToExecute, and end.

Determine international status

The DIRS feature can determine both whether the call is international, and whether it is international-exhc.

The has two ways for determining the international status of a call. The first does so by looking at ISO country codes, the second by looking at MCCs. ISO country codes are the preferred method, however the full set of codes required for this method is only available in specific circumstances.

If the original number did not include a + prefix, and the profile field nonInternationalFormatDNIsNational is set to true, then international status determination is skipped and both the International and InternationalExHC session state fields are set to false.

From ISO country codes

In order to determine international status from ISO country codes, three separate codes must be available:

  1. The country code for the home network, which is is a part of Sentinel’s configuration and should always be available.

  2. The country code for the visited network, which is retrieved as described above.

  3. The country code for the destination number, which is currently only available for numbers within the North American number plan that also have geographic area codes. It will only be derived on originating calls that use the North American Numbering Plan feature.

When all three of the required country codes are available, the international status of the call will be determined based on the relationship of the three codes according to the following table:

Visited Network ISO CC Destination Number ISO CC International? International-ExHC?

Same as home network

Same as home network

No

No

Same as home network

Different from home network

Yes

No

Different from home network

Same as visited network

No

No

Different from home network

Same as home network

Yes

No

Different from home network

Different from both home and visited network

Yes

Yes
From MCC and number prefix

The DetermineInternationalAndRoamingStatus feature does a longest-prefix search of the prefix address list with the address string.

If a match is found, then the address starts with a prefix of significance within the scope of the MCC or visited network. The feature can set the International session state field in two ways:

  • If an MCC has been determined for the served user and there is a list of MCCs present in the prefix address list entry, then 'International' is set to 'true' if the served user MCC is not present in the address list entry.

  • If either MCC could not be found then 'International' is set to not networkPrefixListEntry.isVisitedNetwork().

The internationalExHC session state field is set to International and not networkPrefixListEntry.isHomeNetwork().

If a prefix address list match is not found, then it must be an international call; so the feature sets the International session state field to true and the internationalExHC session state field to true.

Using MCC specific prefix address lists

The DetermineInternationalAndRoamingStatus feature uses a single prefix address list named DEFAULT unless useMCCSpecificAddressListTables is configured as true in the feature’s profile.

MCC specific prefix address list tables may be needed for more advanced scenarios where different MCCs are desired to not be treated as international.

Determine roaming status

The home network ids define the home network for the subscriber.

If the feature finds a non-empty MCC for the visited network, it compares that value with the home MCCs using the PLMN ID Analyser Component.

If it is not a home MCC the feature sets the RoamingStatus to INTERNATIONAL and the RoamingIndicator session state field is set to true.

If they are equal and the PLMN ID is a home PLMN ID, the feature sets the RoamingStatus to NOT_ROAMING and the RoamingIndicator session state field is set to false.

If they are equal and the visited MNC is not present in the home MNCs, the feature sets the RoamingStatus to NATIONAL and the RoamingIndicator session state field is set to false.

If no MCC is present then the feature does the roaming analysis based on the ISO Country Code.

If the ISO country code is equal to the configured home network ISO country code, the feature sets the RoamingStatus to NOT_ROAMING and the RoamingIndicator session state field is set to false.

If they are not equal the feature sets the RoamingStatus to INTERNATIONAL and the RoamingIndicator session state field is set to true.

If no ISO country code is present then the feature does the roaming analysis based on the visited-network-id.

If the visited-network-id is a member of the set of home network ids, the feature sets the RoamingStatus to NOT_ROAMING and the RoamingIndicator session state field is set to false.

If the visited-network-id is not a member of the set of home network ids, the feature sets the RoamingStatus to INTERNATIONAL and the RoamingIndicator session state field is set to true.

If neither the visited MCC nor the visited network are present, the feature sets the RoamingStatus to UNKNOWN.

OC-Roaming-Status Header

Setting the Header

If the feature is running on a terminating MMTel instance, and CAP charging is enabled, it will attempt to add an OC-Roaming-Status header to the outbound request. The value of the header will be set to match the value of RoamingStatus.

Using the Header

When the feature is invoked, it will check for an OC-Roaming-Status header on the inbound request. If the header is found, the feature will forgo the usual process for determining the roaming status. Instead, the value of the header will be used to set the RoamingStatus field, and if the value is INTERNATIONAL the RoamingIndicator field will be set to true. The international status of the call will not be determined if the header is found, as it should only be present for the SCC AS, which does not need the international status. If the header is absent the feature will go through the usual roaming and international determination procedure as described above.

Session state inputs and outputs

Inputs

Name Type Format Description Behaviour if null/invalid

SentinelSelectionKey

com.opencloud. sentinel.common.SentinelSelectionKey

selection key (for example, <platform>:<network>:::)

For selecting configuration data

Report featureCannotStart, featureHasFinished if the network operator field is not set.

CallType

com.opencloud.sentinel.common.CallType

One of: MobileOriginating, MobileTerminating, MobileForwarded, NetworkInitiated, EmergencyCall

Session type of this call

Report featureCannotStart, featureHasFinished

IMSDefaultPublicID

java.lang.String

tel URL or SIP URI

the default-public-id (set by IMSIDLookup)

Increment statistic SubscriberNotLoggedIn and report featureHasFinished

ImsInformation. ImsVisitedNetworkIdentifier

java.lang.String

recommended format is epc.ims.mnc<MNC>.mcc<MCC>.3gppnetwork.org according to IR65

The visited network id extracted from the Invite request or from the registration data by the Diameter Leg Info feature

Try to extract from the triggered request

PaniMccsMncs

List<MccMnc>

MCC and MNC as String

A list of MCCs and MNCs extracted from the P-Access-Network-Info header from the request or from the registration data by the Extract Network Info Feature

Try to extract from the session state PvniMccMnc

PvniMccMnc

com.opencloud.sentinel.common.MccMnc

MCC and MNC as String

A list of MCC and MNC extracted from P-Visited-Network-Id header from the request or from the registration data by the Extract Network Info feature

Try to use the ISO country code

IsoCountryCode

java.lang.String

Two-letter ISO country code

An ISO country code determined by the Extract Network Info or Determine Location From MSRN feature.

Try to use visited-network-id

ChargeMode

com.opencloud.volte.sentinel.common.sessionstate.types.ChargeMode

ChargeMode enum value

Used to determine whether a OC-Roaming-Status header should be included on the outbound message.

Header will not be included.

NANPNumberInfo

com.opencloud.sentinel.numbers.NANPNumberInfo

Data Structure

Used to retrieve the destination ISO country code.

ISO country code based international determination will not be used.

Outputs

Name Type Format Description

International

boolean

true or false

the international condition as defined by 3GPP 24.611

InternationalExHC

boolean

true or false

the international-exHC condition as defined by 3GPP 24.611

RoamingIndicator

boolean

true or false

true, if the subscriber is roaming

RoamingStatus

enum

NOT_ROAMING, NATIONAL, INTERNATIONAL, UNKNOWN

  • NOT_ROAMING if served user is in home network.

  • NATIONAL if served user is in home country but not in the home mobile network.

  • INTERNATIONAL if served user is not in his home country.

  • UNKNOWN if there were not enough information to assert roaming.

Error scenarios

These scenarios trigger the following reports.

Scenario Report

Sessionstate SentinelSelectionKey network operator field is not set

featureCannotStart

Sessionstate CallType is null

featureCannotStart

No Called Party Leg available from the LegManager

featureCannotStart

Cannot determine a digit String to analyse in originating case

featureIssuedWarning

Cannot determine a digit String to analyse in terminating case

featureIssuedWarning

There is no prefix address list for a visited-network-id

featureFailedToExecute

No registration data found for default-public-id

featureFailedToExecute

Registration data fetched for default-public-id indicates this id is not a default-public-id

featureFailedToExecute

Statistics

DetermineInternationalAndRoamingStatus statistics are tracked by the volte.sentinel.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → volte.sentinel.sip service → volte.sentinel.sip SBB → feature → DetermineInternationalAndRoamingStatus
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=volte.sentinel.sip,vendor=OpenCloud,version=4.1].SbbID[name=volte.sentinel.sip,vendor=OpenCloud,version=4.1].feature.DetermineInternationalAndRoamingStatus"

Parameter Type Description 
Started

Counter

Incremented each time the feature runs

 
FailedToStart

Counter

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Counter

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Counter

Incremented when a fatal error occurs during feature execution

 
TimedOut

Counter

Incremented when feature execution does not complete within a reasonable time frame

 
VisitedNetworkHeaderFound

Counter

Incremented when the requestURI identity is in RegistrationRecords list of public identities.

 
AccessNetworkMccFound

Counter

Incremented when the mobile-Country-Code is found in the P-Access-Network-Info header.

 
DeterminedInternationalUsingAccessNetworkMcc

Counter

Incremented when the MCC prefix address list is used to determine whether the call is international.

 
DeterminedInternationalUsingVisitedNetworkId

Counter

Incremented when the visited-network-id prefix address list is used to determine whether the call is international.

 
DeterminedInternationalUsingIsoCC

Counter

Incremented when ISO country codes are used to determine whether the call is international.

 
CouldNotGetPVisitedNetworkID

Counter

Incremented when no visited network ID information could be found.

 
HomeNetworkIdSetForNetworkOperatorIsEmpty

Counter

Incremented when the Sentinel SIP configuration for the network operator has an empty home-network-id set (the feature cannot determine if the subscriber is roaming).

 
InternationalRoaming

Counter

Incremented when the feature determines that the served user is roaming in a foreign country.

 
NationalRoaming

Counter

Incremented when the feature determines that the served user is roaming in their home country.

 
NotRoaming

Counter

Incremented when the feature determines that the served user is on their home network.

 
UnknownRoaming

Counter

Incremented when the feature is unable to determine the served user’s roaming status.

 
AddressNotMinimumLength

Counter

Incremented when destination address is less than the configured minimum length

 
AddressOnSkipList

Counter

Incremented when destination address matches an entry in the SkipDIRSAddressList

 
StatusDeterminedFromHeader

Counter

Incremented when the roaming status is determined from a OC-Roaming-Status header on the incoming request.

 
NoActionRequired

Counter

Incremented when the feature determines that it does not need to do anything for the current invocation.

DetermineChargeMode

This feature uses information from the incoming INVITE request to determine whether Ro Online charging should be applied to the session, by setting the MonitorCallOnly session state variable. The MonitorCallOnly variable affects whether Sentinel VoLTE should perform online charging through Diameter Ro, or only monitor the call. Online Charging through CAP is handled by a separate service composition, see Service Compositions for more details about this. Offline Charging and whether to use CDRs, Diameter Rf or both is controlled by the VoLTE Interim CDR Feature.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Any and All

No

Originating and Terminating

SIPAccess_SessionAccept

No

No

Stateless

POJO

Session output variables

Session State variable name Variable type Comments 
MonitorCallOnly

boolean

True if the feature finds the Route Header “oc-charge-mode” Parameter set to cap or offline.

 
ChargeMode

ChargeMode (enum)

The charge mode determined by the feature.

Statistics

DetermineChargeMode statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → DetermineChargeMode
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.DetermineChargeMode"

Name Description 
Started

Incremented each time the feature runs

 
FailedToStart

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Incremented when a fatal error occurs during feature execution

 
TimedOut

Incremented when feature execution does not complete within a reasonable time frame

 
MonitorOnly

Incremented when the feature has set the MonitorCallOnly Session State field to true

 
NonMonitorOnly

Incremented when the feature has set the MonitorCallOnly Session State field to false

 
Error

Incremented when the feature was unable to determine the charge mode

Behaviour

This feature checks information from the incoming SIP request in order to set a Session State variable which affects Sentinel VoLTE’s charging behaviour.

Values examined

Value Name Source Notes

Route Header “oc-charge-mode” Parameter

Incoming SIP request

This is a custom parameter on the URI of the top-most route header. It is expected that this will be added by the S-CSCF based on iFCs.

Charge mode selection circumstances

Route Header “oc-charge-mode” Parameter Resulting Charging behaviour

oc-charge-mode=ro

MonitorCallOnly set to false, Diameter Ro charging will be applied, ChargeMode set to RO

oc-charge-mode=cap

MonitorCallOnly set to true, Diameter Ro charging will not be applied, ChargeMode set to CAP

oc-charge-mode=offline

MonitorCallOnly set to true, Diameter Ro charging will not be applied, ChargeMode set to OFFLINE

oc-charge-mode has any other value

MonitorCallOnly set to false, Diameter Ro charging will be applied, ChargeMode set to DEFAULT

oc-charge-mode parameter absent

MonitorCallOnly set to false, Diameter Ro charging will be applied, ChargeMode set to DEFAULT

Note that the VoLTE Interim CDR Feature is configured to select whether interim CDRs and/or ACRs are used. It is used if Diameter Rf and/or Interim CDRs are selected during installation. It’s settings are independent of the oc-charge-mode Route Header parameter.

DetermineInitialLegNames

This feature uses the Leg Manager to get the names of the original SIP legs established during call set up, and saves the values to a set of session state fields that may be used by other VoLTE features when they need to access a specific leg by name.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Both or either of MMTEL or SCC

No

Originating and Terminating

SIPAccess_*PreCreditCheck AND SIPAccess_PartyResponse

No

No

Stateless

POJO

Prerequisite features

These features must run before DetermineInitialLegNames:

  • DetermineCallType

Session input and output variables

Session input variables

Session state variable name Variable type 
CallType

Enum

Session output variables

Session state variable name Variable type Comments 
CurrentLocalLegName

String

The name of the leg towards the local UE (that is, the calling party on an originating instance, or the called party on a terminating instance)

 
CurrentRemoteLegName

String

The name of the leg towards the remote UE (that is, the called party on an originating instance, or the calling party on a terminating instance)

 
CurrentCallingLegName

String

The name of the leg towards the calling party

 
CurrentCalledLegName

String

The name of the leg towards the called party

Statistics

DetermineInitialLegNames statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → DetermineInitialLegNames
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.DetermineInitialLegNames"

Name Description 
FeatureStarted

Incremented each time the feature runs

 
FeatureFailedToStart

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature

 
FeatureIssuedWarning

Incremented when a non-fatal problem is encountered and the feature issues a warning

 
FeatureFailedDuringExecution

Incremented when a fatal problem is encountered and the feature cannot execute correctly

 
FeatureTimedOut

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution

 
FeatureCallingLegNameSet

Incremented when calling leg name is found

 
FeatureCalledLegNameSet

Incremented when called leg name is found

Behaviour

Network pre-credit check

When invoked at the SipAccess_NetworkPreCreditCheck execution point the feature will do the following:

  • Retrieve the leg that the initial INVITE arrived on and get its name.

  • Set the CurrentCallingLegName session variable to the leg’s name.

  • On an originating instance, set the CurrentLocalLegName session variable to the leg’s name;
    on a terminating instance, set the CurrentRemoteLegName session variable to the leg’s name.

SIP access party response

When invoked at the SipAccess_PartyResponse execution point the feature will do the following:

  • Retrieve the leg that the response arrived on and get its name.

  • Verify that the response is to an INVITE and has a 2XX status. (If it isn’t, the feature will stop here.)

  • Set the CurrentCalledLegName session variable to the leg’s name.

  • On an originating instance, set the CurrentRemoteLegName session variable to the leg’s name;
    on a terminating instance, set the CurrentLocalLegName session variable to the leg’s name.

DetermineVoltePlanId

This feature uses information from an incoming INVITE, MESSAGE or SUBSCRIBE request, and from session state to set the plan ID in the Sentinel selection key . The plan ID affects which features will run for the call on the current AS instance. It also will set some Session State fields.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Any and All

No

Originating and Terminating

SIPAccess_SessionAccept, SubscriptionAccept, SipTransaction_Accept

Yes

No

Stateless

POJO

Prerequisite features

These features must run before DetermineVoltePlanId:

  • DetermineCallType

  • SCCDetermineSessionType (Only required on SCC AS)

Session input variables

Session State variable name Variable type 
CallType

Enum

 
SCCSessionType

Enum

 
SentinelSelectionKey

SentinelSelectionKey

Session output variables

Session State variable name Variable type Comments 
SentinelSelectionKey

SentinelSelectionKey

Updated by the feature based on factors described in the Behaviour section.

 
RequestIsForMmtelTransfer

Boolean

Set to true if request is targeted at configured Session-Transfer-To-Own-Device special URI.

 
ConferenceFactoryPSI

String

Set if the SIP request URI is a conference factory PSI supported by the platform.

Network operator data

Parameter Type Description Default 
MmtelTransferNumber

String

SIP or TEL URI for special Session-Transfer-To-Own-Device

none

Statistics

DetermineVoltePlanId statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → DetermineVoltePlanId
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.DetermineVoltePlanId"

Name Type Description 
Started

Counter

Incremented each time the feature runs

 
FailedToStart

Counter

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Counter

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Counter

Incremented when a fatal error occurs during feature execution

 
TimedOut

Counter

Incremented when feature execution does not complete within a reasonable time frame

 
NoPlanSelected

Counter

Incremented when the feature fails to select an appropriate plan ID

 
MmtelOriginatingPlanSelected

Counter

Incremented when the feature selects the plan ID as “mmtel-orig”

 
MmtelTerminatingPlanSelected

Counter

Incremented when the feature selects the plan ID as “mmtel-term”

 
MmtelConferencingPlanSelected

Counter

Incremented when the feature selects the plan ID as “mmtel-conf”

 
SccOriginatingPlanSelected

Counter

Incremented when the feature selects the plan ID as “scc-orig”

 
SccTerminatingPlanSelected

Counter

Incremented when the feature selects the plan ID as “scc-term”

 
SccTerminatingTadsOnlyPlanSelected

Counter

Incremented when the feature selects the plan ID as “scc-term-tads”

 
SccTerminatingAnchorOnlyPlanSelected

Counter

Incremented when the feature selects the plan ID as “scc-term-anchor”

 
SccReoriginationPlanSelected

Counter

Incremented when the feature selects the plan ID as “scc-reorigination”

 
SccAccessTransferPlanSelected

Counter

Incremented when the feature selects the plan ID as “scc-access-transfer”

 
ConferenceConfigurationNotFound

Counter

Incremented when the feature is unable to find a valid conference PSI from configuration profiles

 
PlanIDAlreadySet

Counter

Incremented when the feature detects that a plan ID has already been selected

Behaviour

This feature checks a series of values from session state, feature configuration, and the incoming SIP request in order to select the appropriate session plan to run, and possibly set some Session State fields.

Values examined

Value Name Source Notes

Custom Route Header oc-mode Parameters

Incoming SIP request

These are custom parameters on the URI of the top-most route header. It is expected that these will be added by the S-CSCF based on iFCs.

SCCSessionType

Session State

This is set by the SCCDetermineSessionType feature when it detects the incoming request is for Access Transfer or Reorigination, as these requests do not come from the S-CSCF there should never be a oc-mode parameter on the route header.

Call Type

Session State

Set by the DetermineCallType feature.

Request URI

Incoming SIP request

Analysed to determine if it corresponds to a supported conference factory PSI (when a conference call is being requested).
Note

If the Request URI of the incoming sip request is a supported conference factory PSI, the PSI is stored in session state.

Custom Route Header Parameters

Sentinel VoLTE supports specific custom headers and header parameters to indicate or propagate certain conditions between nodes in the network.

Plan ID selection circumstances

Route Header oc-mode Parameter SCCSessionType Call Type SIP Request-URI Matches Conference PSI Resulting Plan ID

(Not Present)

Access Transfer

(Ignored)

(Ignored)

scc-access-transfer

(Not Present)

Reorigination

(Ignored)

(Ignored)

scc-reorigination

oc-mode=mmtel

(Ignored)

Originating

(Ignored)

mmtel-orig

oc-mode=mmtel

(Ignored)

Terminating

No

mmtel-term

oc-mode=mmtel

(Ignored)

Terminating

Yes

mmtel-conf

oc-mode=scc

(Ignored)

Originating

(Ignored)

scc-orig

oc-mode=scc

(Ignored)

Terminating

(Ignored)

scc-term

oc-mode=scc-tads

(Ignored)

Terminating

(Ignored)

scc-term-tads

oc-mode=scc-anchor

(Ignored)

Terminating

(Ignored)

scc-term-anchor
Note
If Then …​

The route header oc-mode parameter is not present

and

the SCCSessionType is not ‘Access Transfer’ or ‘Reorigination’

The feature will proceed as if the route header oc-mode parameter was set to ‘mmtel’.

A Plan ID has already been set on the Sentinel Selection Key

The feature will not attempt to do any analysis or change the plan ID.

DialPlanEnforcement

This feature analyses the request-uri of an originating trigger to determine if the dialed digits match the dial plan

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

MMTEL

Yes

Originating

SipAccess_SessionCheck

No

No

Stateless

POJO

Prerequisite features

DialPlanEnforcement should run after the DetermineVoltePlanId feature.

Session input and output variables

Session input variables

Session state variable name Variable type Comments 
SentinelSelectionKey

SentinelSelectionKey

  • Affects which configuration profile is used

  • DialPlanEnforcement inspects the plan ID field to determine if the session is originating

Session output variables

Session state variable name Variable type Comments 
RejectedCallAsDialPlanDoesNotMatch

boolean

The call is being rejected

 
AnnouncementID

int

The announcement to play (for SipPlayAnnouncement)

 
EndSessionAfterAnnouncement

int

End the session with this sip response, after playing an announcement (for SipPlayAnnouncement)

Statistics

DetermineInitialLegNames statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → DialPlanEnforcement
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.DialPlanEnforcement"

Name Description 
FeatureStarted

Incremented each time the feature runs

 
FeatureFailedToStart

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature

 
FeatureIssuedWarning

Incremented when a non-fatal problem is encountered and the feature issues a warning

 
FeatureFailedDuringExecution

Incremented when a fatal problem is encountered and the feature cannot execute correctly

 
FeatureTimedOut

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution

 
IgnoringAddress

Incremented when analysis is not required

 
DialPlanMatched

Incremented when the call is allowed as the dialed digits match the dial plan

 
DialPlanIsNotMatched

Incremented when the call is rejected as the dialed digits do not match the dial plan

Configuration

The DialPlanEnforcement feature uses configuration data from the DialPlanEnforcementConfigProfileTable and the NormalizationFeatureConfigProfileTable.

DialPlanEnforcementConfigProfileTable

The profiles within this table have the following fields:

Parameter Type Description

EndSessionOnEnforcement

boolean

Whether a session should be ended with an announcement if the dialed digits do not match the dial plan

EndSessionAnnouncementID

int

The announcement to play if the dialed digits do not match the dial plan.

The announcement ID should correspond to an ID that has been configured for SipPlayAnnouncement

EndSessionSipResponseCode

int

The SIP response code to use when ending the session

PrefixesToCheck

String[]

Set of prefixes to check for in the dialed digit string.

PrefixesToCheck may be empty. The length of PrefixesToCheck, MinimumNumberOfDigitsPerPrefix and MaximumNumberOfDigitsPerPrefix must be the same

MinimumNumberOfDigitsPerPrefix

int[]

Minimum allowed length of dialed digits (after the prefix) per prefix.

Must have the same number of elements as PrefixesToCheck. The value of each element may be 0 and must be less then the corresponding element in MaximumNumberOfDigitsPerPrefix

MaximumNumberOfDigitsPerPrefix

int[]

Maximum allowed length of dialed digits (after the prefix) per prefix.

Must have the same number of elements as PrefixesToCheck. The value of each element in MaximumNumberOfDigitsPerPrefix must be greater than the corresponding element in MinimumNumberOfDigitsPerPrefix

DefaultMaximumNumberOfDigits

int

The required length of dialed digits if there are no prefixes configured or matched.

The value must be within the range 7 .. 20.
Note

DialPlanEnforcement checks for prefixes in order from the longest prefix first.

NormalizationFeatureConfigProfileTable

The DialPlanEnforcement uses the following fields from profiles within this table:

Parameter Type Description

NationalPrefix

String

National dialling prefix (for example, 0)

InternationalEscapeCode

String

Escape code for dialing international numbers (for example, 00)

MinNormalizableLength

Integer

The minimum length of an address for it to be normalizable

Behaviour

The first step is to determine if DialPlanEnforcement should be applied to the incoming trigger. The following conditions must be satisfied:

  • the sentinel selection key plan ID field is MMTEL_ORIG

  • the request-uri is a phone number (either a Tel URL or a SIP URI with a phone number in the user part)

  • the DialPlanEnforcement feature is enabled (config.EndSessionOnEnforcement is true)

  • the number of dialed digits is greater than, or equal to, the minimum number for analysis

Note

The minimum number for analysis is the minimum value of these properties:

  • normalizerconfig.MinNormalizableLength

  • config.DefaultMaximumNumberOfDigits

  • For each configured prefix:

    • if allowed minimum == 0, prefix length + allowed maximum else prefix length + allowed minimum

If DialPlanEnforcement should be applied, then the following analysis of the request-uri is conducted.

  1. If the dialed digits is an international number, starts normalizerconfig.NationalPrefix or starts with normalizerconfig.InternationalEscapeCode then accept the trigger otherwise continue analysis.

  2. Check for prefixes in the dialed digit string in order from the longest prefix first. If there is a prefix match, then compare the number of digits after the prefix to the allowed minimum and allowed maximum configured for that prefix. If the number of digits in within range accept the trigger, otherwise reject the trigger by requesting an announcement to be played (config.EndSessionAnnouncementID) and ending the session.

  3. If no prefix match is made, compare the number of dialed digits to config.DefaultMaximumNumberOfDigits. If the number of digits is less than, or equal to, config.DefaultMaximumNumberOfDigits then accept the trigger otherwise reject the trigger by requesting an announcement to be played (config.EndSessionAnnouncementID) and ending the session.

Note

A SAS event is generated when DialPlanEnforcement accepts a trigger or rejects a trigger.
Statistics are incremented when DialPlanEnforcement ignores a trigger, accepts a trigger or rejects a trigger.

FeatureCapsManagement

This feature sets values for the Feature-Caps header on outgoing messages based on data from the session’s FeatureCapsManager

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

SCC

No

Originating and Terminating

SipAccess_SubscriberCheck, SipAccess_PartyRequest, SipAccess_PartyResponse, SipAccess_ServiceTimer, SipInstructionExecutionFailure, SipMidSession_PartyRequest, SipMidSession_PartyResponse, SipEndSession

No

No

Stateless

POJO

Session input variables

Session State variable name Variable type Comments 
FeatureCapsManager

FeatureCapsManager

Contains information about which Feature-Caps header values should be applied to outgoing messages on each SIP leg

Statistics

FeatureCapsManagement statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → FeatureCapsManagement
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.FeatureCapsManagement"

Name Description 
Started

Incremented each time the feature runs

 
FailedToStart

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Incremented when a fatal error occurs during feature execution

 
TimedOut

Incremented when feature execution does not complete within a reasonable time frame

 
StrippedValuesFromMessage

Incremented when the feature removes Feature-Caps parameter values from a message

 
AddedValuesToMessage

Incremented when the feature adds Feature-Caps parameter values to a message

Behaviour

This feature interacts with the session’s FeatureCapsManager interface and its associated LegFeatureCapsHandler interfaces. These interfaces are documented in the Sentinel VoLTE SPI Javadoc.

When invoked, the FeatureCapsManagement feature iterates over all SIP legs associated with the current session. For each leg, the feature will check if there is a LegFeatureCapsHandler for that leg in the session’s FeatureCapsManager. If there is a LegFeatureCapsHandler for the leg, the feature will look for SIP INVITE requests and responses in the leg’s outgoing message queue. Each INVITE request or response found in the queue will be processed as described below. Each individual message in the queue will only be processed once (i.e. if the feature is invoked multiple times before a given message is sent, that message will only be processed on the first time that it is seen).

Values to Strip

When a message is processed, the feature will first determine if the LegFeatureCapsHandler has any Feature-Caps values to strip. If so, the feature will look for those values on any existing Feature-Caps header on the message. If the values are found, they will be removed from the given header.

Values to Add

After stripping values, the feature will check the LegFeatureCapsHandler for Feature-Caps values to add to the message. If values are found, then a new Feature-Caps header will be appended to the message. The new header will contain all of the values to add.

It is possible for the LegFeatureCapsHandler to indicate that new Feature-Caps values are currently suppressed for the leg. If this is the case, the feature will forgo adding any new Feature-Caps values to the outgoing message.

FetchIMCSI

The FetchIMCSI feature retrieves CAMEL Subscription Information (CSI) from the HLR for charging purposes .

Feature cheat sheet

Feature Script Name

FetchIMCSI

MMTel or SCC

Both

Call-Type

Orig or Term

Session Plan

mmtel-orig, scc-tads-only

Execution Points

SipAccess_SubscriberCheck

Network Operator Config

Yes

Subscriber Config

No

POJO or SBB

POJO

Feature FSMs

None

Feature Parameters

None

SAS Support

Yes

RA Entity Links

sentinel-sis-in-hlr

Prerequisite features

Network Operator Data

The FetchIMCSI feature depends on configuration from four profile tables:

  • The FetchIMCSIConfigProfileTable provides the basic configuration for the feature.

  • The FetchIMCSIFeatureServiceKeyProfileTable provides mapping between orig and term service keys.

  • The HLRConfigProfileTable provides configuration for sending requests to the HLR.

  • The CapChargingConfigProfileTable provides configuration for how the feature should behave on non-roaming terminating calls.

FetchIMCSIConfigProfileTable

Basic feature configuration is stored on a profile table called FetchIMCSIConfigProfileTable.

Data is scoped according to a Sentinel selection key.

Attribute Name Type Default Description 
FetchImcsiEnabledOnOrigCall

boolean

false

Enables/Disables the feature for originating calls.

 
RequestedTdpOnOrigCall

int

1 (orig), 12 (term)

Trigger Detection Point to request on originating calls, determines whether the O-CSI or T-CSI is retrieved from the HLR. (1, 2, or 3 for O-CSI; 12 for T-CSI).

 
FetchImcsiEnabledOnTermCall

boolean

false

Enables/Disables the feature for terminating calls.

 
RequestedTdpOnTermCall

int

1 (term), 12 (term)

Trigger Detection Point to request on terminating calls, determines whether the O-CSI or T-CSI is retrieved from the HLR. (1, 2, or 3 for O-CSI; 12 for T-CSI).

FetchIMCSIFeatureServiceKeyProfileTable

This profile table is used to provide mappings between orig and term TDP service keys. These mappings are used when the TDP requested is for a different call type (i.e. originating/terminating) than the session.

Data is scoped according to a Sentinel selection key, with a suffix which corresponds the the service key to map from. A default suffix can be used to define a mapping for keys that do not have specific profiles.

Attribute Name Type Default Description 
SourceServiceKey

String

None

The service key to map from, or 'default' to match all service keys that do not have a more specific match for the selection key.

 
TargetServiceKey

int

None

The service key to map to.

HLRConfigProfileTable

This profile table provides the configuration for connecting to the HLR. It is shared across all features that communicate with the HLR.

For more information refer to HLR MAP Configuration.

CapChargingConfigProfileTable

The feature checks a single field on the OnlyChargeTerminatingCallsIfInternationalRoaming profile table. This is used to determine if the feature needs to do anything on a non-roaming terminating call.

For more information refer to CapChargingConfigProfileTable.

Session Input Variables

Variable name Type Comments

ChargeMode

Enum

The feature will only run if the charge mode is CAP.

CallType

Enum

Affects whether orig or term feature config is loaded, and depending on the TDP, whether the service key is mapped.

SentinelSelectionKey

SentinelSelectionKey

Affects which profiles are loaded from each configuration table.

Session Output Variables

Variable name Type Comments 
OcImTdpHeader

String

Contains the data that was retrieved from the HLR, ready for inclusion in a header on the SIP message towards the IMSSF.

Statistics

FetchIMCSI statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → FetchIMCSI
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.FetchIMCSI"

Statistic

Type

Description

 
Started

Counter

Incremented when the feature is invoked.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
ExecutionNotRequired

Counter

Incremented when the feature determines that it does not need to do anything.

 
RequestSent

Counter

Incremented when an ATSI request is sent to the HLR.

 
RequestFailed

Counter

Incremented when no result is received after attempting to send a request.

 
ReceivedATSIResult

Counter

Incremented when an ATSI result is received from the HLR.

 
DialogOpenRefused

Counter

Incremented when a DialogOpenRefused event is received after attempting to send a request.

 
UserAbortedDialog

Counter

Incremented when a UserAbortedDialog event is received after attempting to send a request.

 
ProviderAbortedDialog

Counter

Incremented when a ProviderAbortedDialog event is received after attempting to send a request.

 
OperationErrorOccurred

Counter

Incremented when a OperationErrorOccurred event is received after attempting to send a request.

 
InvalidResponse

Counter

Incremented when an ATSI result is received for a request, but it does not contain the requested data.

 
ServiceKeyMappingFailed

Counter

Incremented when a service key requires mapping, but no mapped value can be found.

 
FetchedIMCSI

Counter

Incremented when the feature successfully retrieved CSI information from the HLR.

 
AttachedToMapRequestAci

Counter

Incremented when the feature creates and attaches to the activity for the MAP request.

 
DetachedFromMapRequestAci

Counter

Incremented when the detaches from the activity for the MAP request.

 
ResponseLatency

Sample

Time from sending the ATSI request to receiving the ATSI result, sampled on receipt of the result.

Installation

FetchIMCSI is a GSM only feature and as such will only be deployed if GSM mode is selected in the installer. Additionally the feature will only be enabled in its configuration profile if explicitly done so in the installer. The feature is only useful when CAP charging is being used, so the option to enable it will only be given by the installer if CAP charging is selected.

Behaviour

The FetchIMCSI feature retrieves the O-CSI or T-CSI data for a subscriber from the HLR. The data in the response is extracted and put into a format for use in an OC-IM-TDP SIP header, which is sent to the IMSSF when doing CAP charging.

Sending the Request

When initially triggered, the feature will construct a Any Time Subscription Interrogation (ATSI) request in order to retrieve the required data from the HLR.

Execution Conditions

Before creating the request, the feature will check that the following conditions are met:

  1. The enabled flag corresponding to the call type is true in the feature configuration profile.

  2. The charge mode for the call is CAP

  3. If the call is terminating and not international roaming, the OnlyChargeTerminatingCallsIfInternationalRoaming config flag is false.

If any of these conditions is not met, the feature will immediately finish execution without sending a request.

The ATSI Request

If the conditions are met, the feature will create the ATSI request towards the HLR.

The subscriber identity to request information for will be a digit string taken from the default public ID in the served user’s registration data. If a digit string is not found in the default public ID, then the feature will attempt to retrieve one from the Subscriber session state field. If Subscriber field also does not have an appropriate ID, then the feature will abort its attempt to create a request and record an error.

The data the feature requests from the HLR depends on the Requested TDP field corresponding to the call type in the feature configuration profile. The request will either be for the O_CSI or the T_CSI according to the following table:

TDP Value Requested Data

2 or 3

O_CSI

12

T_CSI

Once the request is created, a MAP dialog will be opened to the HLR and the request will be sent. The feature will then enter a waiting state until a response is received.

Processing the Result

On receipt of an ATSI result from the HLR, the feature will attempt to extract the information within, and format it into an OC-IM-TDP header. This header will be put into the OcImTdpHeader session state field.

OC-IM-TDP Header

This header is formatted as a comma separated list of property=value pairs. It has the following data:

Property Name Value 
bcsmTriggerDetectionPoint

collectedInfo if the CallType is originating, termAttemptAuthorized if it is terminating.

 
defaultCallHandling

continueCall or releaseCall based on the DefaultCallHandling field in the requested TDP data in the ATSI result. May be absent if the field was empty in the result.

 
serviceKey

See below.

 
scfAddress.address

The address part of the GsmSCF_Address field in the requested TDP data in the ATSI result.

 
scfAddress.nature

The nature part of the GsmSCF_Address field in the requested TDP data in the ATSI result.

 
scfAddress.numberingPlan

The numbering plan part of the GsmSCF_Address field in the requested TDP data in the ATSI result.
Service Key

The serviceKey property in the final OC-IM-TDP header has special handling. If the requested information matches the session’s call type (i.e. O_CSI is requested on an originating call, or T_CSI requested on a terminating call), then the final serviceKey value used in the header will match the value of the ServiceKey field in the requested TDP data in the ATSI result. If the requested information does not match the call type, then the feature will attempt to map the service key to a different value based on the service key mapping profile.

To find the mapped value, the feature will search for a profile on the FetchIMCSIFeatureServiceKeyProfileTable profile table. The profile name used will be the sentinel selection key with the service key received in the ATSI result as a suffix. Standard selection key matching will apply, where the profile with the longest matching selection key and a matching service key suffix will be used. If no matching profile with the service key is found, then the feature will reattempt the search with default as the suffix. If still no profile is found, the feature will use the original, unmapped service key in the OC-IM-TDP header. If a profile is found, the value of the TargetServiceKey will be used in the OC-IM-TDP header.

Handling of Request Failure

If the feature fails to retrieve the requested information for any reason, it will increment the feature statistic that best explains why, and report the details to SAS. Beyond that, the feature will abort execution and no further action will be taken.

IMSIDLookup

This feature reads Third Party Registration information stored in the HSS as Transparent Data, and writes it into session state. Information is read during INVITE processing. It reads the Third Party Registration information via the Sh Cache Microservice RA, which connects to the Sh Cache Microservice. For more information refer to Data Stored by the Third Party Registrar in HSS.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Both or either of MMTEL or SCC

Yes

Originating, Forwarding, and Terminating

SIP Access Session Pre-Credit Check

No

No

Stateless

SBB

Prerequisite features

These features must run before IMSIDLookup:

Session input and output variables

Session input variables

Session State variable name Variable type

Subscriber

String
Note This is the IMS Public Identity for the Served User, and is extracted from the SIP INVITE.

Session output variables

Session State variable name Variable type Comments 
RegistrationRecords

List<RegistrationRecord>

The list of registration records for the subscriber

 
IsLoggedIn

boolean

True, if the feature was able to set both IDs

 
CMSISDN

String

The correlation MSISDN registered for the subscriber

 
HasCMSISDN

boolean

True if the CMSISDN is set

Statistics

IMSIDLookup statistics are tracked by the IMSIDLookup SBB and can be found under the following parameter set:
SLEE-Usage ▶ sentinel.volte.sip service ID ▶ IMSIDLookup SBB ID.

Name Type Description 
Invoked

Counter

Incremented when the feature runs.

 
FeatureError

Counter

Incremented when a fatal error occurs during feature execution.

 
NoSubscriberSpecified

Counter

Incremented when the feature is unable to determine which subscriber to retrieve IDs for.

 
IMSIDRetrieveSuccess

Counter

Incremented when IDs are successfully retrieved and decoded.

 
IMSIDRetrieveFail

Counter

Incremented when ID retrieval or decoding fails.

 
CacheQueried

Counter

Incremented when a query is made to the Sh Cache Microservice.

 
CacheIndicatedQuerySuccess

Counter

Incremented when a success response is received from the Sh Cache Microservice.

 
CacheIndicatedQueryFailure

Counter

Incremented when a failure response is received from the Sh Cache Microservice.

 
SubscriberNotRegistered

Counter

Incremented when the searched subscriber is not present in the Sh Cache Microservice or has no valid registration.

 
RegistrationOutOfSync

Counter

Incremented when the searched subscriber information is not consistent between the network and the Sh Cache Microservice.

 
ResponseLatency

Sampled

Records elapsed time between requesting data from the Sh Cache Microservice and getting a response (in milliseconds).

Behaviour

The feature queries the HSS using an Access Key of the IMS Public Identity of the Served User and the Service Indication of opencloud-3rd-party-registrar.

User logged in

The RegistrationRecords session state field is set to a List of RegistrationRecord. Each element in the list indicates a device, with public and private IDs, that the subscriber is registered on. If the subscriber is registered on only one device, there is only one element in the list. If the subscriber is simultaneously registered on (say) four devices, there will be four elements in the list.

The CMSISDN field will be set if it is present in the data registered for the user. If the subscriber is simultaneously registered on multiple devices, this value will not be set.

User not logged in

If the user is not logged in, the feature finishes execution without modifying any state.

IMSIDLookupFromCassandraIN

This feature reads Third Party Registration information stored in the Cassandra Database, and writes it into session state. Information is read during InitialDP processing. It reads the Third Party Registration information via the Cassandra CQL RA. For more information refer to Cassandra storage.

Note

From Sentinel 3.1.0 if several registration records are present for the IMPU the feature will select the valid (newest) registration per UE based on private identity, +sip.instance, and the creation time of the record. Prior to 3.1.0 it was not guaranteed that the correct registration would be used.

Feature cheat sheet

B2BUA Instance Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

SCC

Terminating

DirectAccessNetworkCheck

No

No

Stateless

SBB

Prerequisite features

These features must run before IMSIDLookupFromCassandraIN:

Session input and output variables

Session input variables

Session State variable name Variable type

Subscriber

String
Note This is the IMS Public Identity for the Served User, and is extracted from the InitialDP.

Session output variables

Session State variable name Variable type Comments 
IsLoggedIn

boolean

True, if the feature was able to find a valid registration record for the subscriber.

Statistics

IMSIDLookupFromCassandraIN statistics are tracked by the IMSIDLookupFromCassandraIN feature and can be found under the following parameter sets:

SLEE-Usage ▶ sentinel.volte.ss7 service ID ▶ sentinel.volte.ss7 SBB ID ▶ IMSIDLookupFromCassandraIN feature.

Name Type Description 
Started

Counter

Incremented when the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

SLEE-Usage ▶ sentinel.volte.ss7 service ID ▶ volte.sentinel.volte-imsid-lookup-cassandra-ss7-feature SBB ID.

Name Type Description 
Started

Counter

Incremented when the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
FeatureError

Counter

Incremented when a feature error occurs.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
CassandraQueried

Counter

Incremented when Cassandra is queried for a subscriber’s registration.

 
NoSubscriberSpecified

Counter

Incremented when no subscriber is specified for the query.

 
SubscriberNotRegistered

Counter

Incremented when the returned subscriber from Cassandra is not registered.

 
IMSIDRetrieveFail

Counter

Incremented when the Cassandra lookup fails.

 
IMSIDRetrieveSuccess

Counter

Incremented when the Cassandra lookup succeeds.

 
ImsUserStateSourceNotApplicable

Counter

Incremented when Sentinel VoLTE is configured to determine the IMS user state from the HSS

 
ResponseLatency

Sampled

Records elapsed time between querying the Cassandra database and getting a response (in milliseconds).

Behaviour

The feature queries the Cassandra Database using a Primary Key of the IMS Public Identity of the Served User. If a valid registration for the subscriber is found, the IsLoggedIn session state field will be set to true. Otherwise it will be set to false.

IMSIDLookupFromCassandraSIP

This feature reads Third Party Registration information stored in the Cassandra Database, and writes it into session state. Information is read during INVITE processing. It reads the Third Party Registration information via the Cassandra CQL RA. For more information refer to Cassandra storage.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Both or either of MMTEL or SCC

No

Originating, Forwarding, and Terminating

SIP Access Session Pre-Credit Check

No

No

Stateless

POJO

Prerequisite features

These features must run before IMSIDLookupFromCassandraSIP:

Session input and output variables

Session input variables

Session State variable name Variable type

Subscriber

String
Note This is the IMS Public Identity for the Served User, and is extracted from the SIP INVITE.

Session output variables

Session State variable name Variable type Comments 
RegistrationRecords

List<RegistrationRecord>

The list of registration records for the subscriber

 
IsLoggedIn

boolean

True, if the feature was able to set both IDs

 
CMSISDN

String

The correlation MSISDN registered for the subscriber

 
HasCMSISDN

boolean

True if the CMSISDN is set

Statistics

IMSIDLookupFromCassandraSIP statistics are tracked by the IMSIDLookupFromCassandraSIP feature and can be found under the following parameter set:
SLEE-Usage ▶ sentinel.volte.sip service ID ▶ sentinel.volte.sip SBB ID ▶ IMSIDLookupFromCassandraSIP.

Name Type Description 
Started

Counter

Incremented when the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
FeatureError

Counter

Incremented when a feature error occurs.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
NoSubscriberSpecified

Counter

Incremented when the feature is unable to determine which subscriber to retrieve IDs for.

 
IMSIDRetrieveSuccess

Counter

Incremented when IDs are successfully retrieved and decoded.

 
IMSIDRetrieveFail

Counter

Incremented when ID retrieval or decoding fails.

 
CassandraQueried

Counter

Incremented when a query is made to Cassandra.

 
MultipleDevicesRegistered

Counter

Incremented when multiple registered devices have been detected.

 
SubscriberNotRegistered

Counter

Incremented when could not find an active subscriber.

 
RegistrationOutOfSync

Counter

Incremented when the searched subscriber information is not consistent between the network and the database.

 
ResponseLatency

Sampled

Records elapsed time between querying the Cassandra database and getting a response (in milliseconds).

Behaviour

The feature queries the Cassandra Database using a Primary Key of the IMS Public Identity of the Served User.

User logged in

The RegistrationRecords session state field is set to a List of RegistrationRecord. Each element in the list indicates a device, with public and private IDs, that the subscriber is registered on. If the subscriber is registered on only one device, there is only one element in the list. If the subscriber is simultaneously registered on (say) four devices, there will be four elements in the list.

The CMSISDN field will be set if it is present in the data registered for the user. If the subscriber is simultaneously registered on multiple devices, this value will not be set.

User not logged in

If the user is not logged in, the feature finishes execution without modifying any state.

IMSUserStateLookupFromHSS

This feature reads the IMS user state from the HSS, and updates session state. Information is read during InitialDP processing. It reads the IMS user state via the Sh Cache Microservice. For more information about the Sh Cache Microservice see Sh Cache Microservice architecture.

Feature cheat sheet

B2BUA Instance Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

SCC

Terminating

DirectAccessNetworkCheck

No

No

Stateless

SBB

Prerequisite features

These features must run before IMSUserStateLookupFromHSS:

Session input and output variables

Session input variables

Session State variable name Variable type

Subscriber

String
Note This is the IMS Public Identity for the Served User, which is extracted from the InitialDP.

Session output variables

Session State variable name Variable type Comments 
IsLoggedIn

boolean

True, if the IMS user state indicates the subscriber is Registered in the IMS.

Statistics

IMSUserStateLookupFromHSS statistics are tracked by the IMSUserStateLookupFromHSS feature and can be found under the following parameter sets:

SLEE-Usage ▶ sentinel.volte.ss7 service ID ▶ sentinel.volte.ss7 SBB ID ▶ IMSUserStateLookupFromHSS feature.

Name Type Description 
Started

Counter

Incremented when the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

SLEE-Usage ▶ sentinel.volte.ss7 service ID ▶ volte.sentinel.scc-lookup-ims-user-state-hss-feature SBB ID.

Name Type Description 
Started

Counter

Incremented when the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
FeatureError

Counter

Incremented when a feature error occurs.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
SubscriberNotRegistered

Counter

Incremented if the subscriber is not registered in the IMS.

 
ImsUserStateQueried

Counter

Incremented when the ShCM is queried for a subscriber’s IMS user state.

 
ImsUserStateRetrieveSuccess

Counter

Incremented when the ShCM lookup succeeds.

 
ImsUserStateRetrieveFail

Counter

Incremented when the ShCM lookup fails.

 
ImsUserStateUnknownSubscriber

Counter

Incremented when the ShCM lookup fails, as the subscriber in unknown in the IMS.

 
ImsUserStateRetrieveSuccessNoData

Counter

Incremented when the ShCM lookup succeeds, but no IMS user state data is returned.

 
ImsUserStateSourceNotApplicable

Counter

Incremented when Sentinel VoLTE is configured to determine the IMS user state from Third Party Registration

Behaviour

The feature queries the ShCM for the IMS user state of the Served User (as identified by the IMS Public Identity that is extracted from the InitialDP). The IsLoggedIn session state field is set to true if the IMS user state returned indicates the server user is registered in the IMS. Otherwise the IsLoggedIn session state field is set to false.

InternationalCallManagement

This feature is responsible for playing an announcement when a subscriber is making an international call. It can also bar an international call (with an optional announcement) if the subscriber does not dial a number in the international format or with an international escape code.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

MMTEL

Yes

Originating

SipAccess_SessionCheck

Yes

No

Stateless

POJO

Behaviour

The InternationalCallManagement (ICM) can enforce that when making an international call, the user actually dialled the country code for that country. If that requirement is not met, the feature can bar the call with an announcement. A call is a valid international call if it is in the international format, contains an international escape code, and the special case for 1+10 digit number if part of the North American Dial Plan (NANP). ICM’s behaviour is configurable; specific parts of ICM’s behaviour are determined by the InternationalCallManagementConfigProfile (ICMCP) Profile Table.

ICM will check if the call is an international call. If it an international call, ICM will continue otherwise if not an international call, will do nothing more.

If the DestinationCountryIsoCC session state field is populated, the feature will retrieve the ICMCP profile with the corresponding ISOCountryCode. If the corresponding ICMCP profile is not found, the feature will use the default profile.

Using the loaded ICMCP configuration, the feature will determine whether an announcement is needed and if the call needs to be barred. ICM will check if the AnalysedDialledNumber session state field matches one of the following: contains the International_Escape_Code, is dialled in the International_Format or if NANP is enabled, matches the special case handling for to allow international calls within the North American Numbering Plan when dialled as 1+10 digit. If the AnalysedDialledNumber does not match any of the checks that validate it as an international number, the call will be barred and the loaded ICMCP profile’s MissingInternationalCallDialPrefixAnnouncement will be queued (if configured).

If the call is not barred, then the announcement set by the loaded ICMCP profile’s InternationalCallAnnouncementID value will be queued (if configured).

If NANP is enabled, then the behaviour of ICM can be optionally configured per country - the behaviour is only supported in the NANP.

Relationship with number translation features

When deciding whether to bar a call based on whether it was dialled in an international format, the ICM feature considers the dialled number as it was originally received by Sentinel.

This means that if a number translation feature such as Location Based Dialling or SIP Short Code modifies the number and that results in the call being considered international, then the call will be barred if the original number was dialled without a country code.

International status determination

The international status of a call is identified by the DetermineInternationalAndRoamingStatus (DIRS) feature. As the ICM feature acts on all international calls, it becomes particularly important that the DIRS feature is configured correctly. Any numbers or number prefixes that are being erroneously classified as international should be added to prefix address list for that feature.

Prerequisite features

The feature must run after the DetermineInternationalAndRoamingStatus and VerticalServiceCodes features.

Session state input variables

Variable name Variable type Description 
International

Boolean

Describes whether or not the call is an international call

 
AnalysedDialledNumber

TaggedNumber

Tagged number contains details about the number dialled and is check if the dialled number is in an international format or has been dialled with an international escape code.

 
DestinationCountryIsoCC

String

The two letter ISO country code the destination area code corresponds to. Set by the DetermineInternationalAndRoamingStatus feature

 
SentinelSelectionKey

SentinelSelectionKey

For selecting configuration data

Session state output variables

Variable name Variable type Description

ICMCallBarred

boolean

Describes whether the call was barred

ICMAnnouncementQueued

boolean

Describes whether an announcement was queued to be played

EarlyMediaAnnouncementInfoQueue

List<SipAnnouncementInformation>

List of all the Early Media info announcements to be played for the call

EndSessionAfterAnnouncement

int

If enabled, will end the call session once the set announcement with the specified BARRING_RESPONSE_CODE response

Configuration

This feature reads the configuration in the feature configuration profile table InternationalCallManagementProfileTable to determine specific parts of the InternationalCallManagement feature’s behaviour.

InternationalCallManagementProfileTable

Feature configuration is stored on the InternationalCallManagementProfileTable.

Data is scoped according to a Sentinel Selection Key; however the profile does support using an ISO country code as additional data on the key.

Parameter Type Description Default 
ISOCountryCode

String

The two letter ISO country code

DEFAULT

 
MissingInternationalCallDialPrefixCallBarring

boolean

If enabled, bar the call if it is international but the number was not dialled with an international escape code or in international format.

false

 
MissingInternationalCallDialPrefixAnnouncementID

int

The ID of the announcement to play when a call is barred due to the Missing International Call Dial Prefix Call Barring setting (0 disables the announcement).

0

 
InternationalCallAnnouncementID

int

The ID of the announcement to play when a call is international and is not barred by this feature (0 disables the announcement).

0

Statistics

InternationalCallManagement statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → InternationalCallManagement
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.InternationalCallManagement"

Name Type Description 
IncrementCallBarred

Counter

Incremented each time a call is barred

 
IncrementPlayingCallBarredAnnouncement

Counter

Incremented when aan international call barred announcement has been queued.

 
IncrementPlayingInternationalCallAnnouncement

Counter

Incremented when an international call announcement has been queued.

SetOcsAnnouncementID

SetOcsAnnouncementID schedules configurable announcements to the subscriber based on Credit-Control-Answers

The feature schedules charging announcements as defined by TS 32.281 as well as announcements for out-of-credit (4012 CCA result code), low balance (Low-Balance-Indicator AVP), and for custom OC-Play-Announcement-Id AVPs.

The feature runs on every successful and 4012 credit check result and analyses the CCA for announcement triggers:

  • Multiple-Services-Credit-Control AVP containing Announcement-Information AVP;

  • OC-Play-Announcement-Id AVP;

  • low balance AVP; or

  • result code 4012.

If the CCA contains such a trigger then the feature schedules the relevant announcement either immediately or on a timer relative to quota exhaustion. The feature is able to schedule multiple announcements to be played.

The feature also runs on each party request for a terminating call to determine whether the session has been established and so if a reauthorization request should be triggered or whether any timers should be set relative to quota exhaustion to start announcements. The feature runs on timer expiry to start any announcements that were scheduled on timers.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature Other notes

MMTEL.

Yes

Originating, Forwarding, and Terminating

SipAccess_PartyRequest SipAccess_ServiceTimer SipAccess_CreditAllocatedPostCC SipMidSession_CreditAllocatedPostCC SipAccess_CreditLimitReachedPostCC SipMidSession_CreditLimitReachedPostCC

Yes

No

Stateless

POJO

Behaviour

Announcements requested in the Announcement-Information AVP are played in preference to other announcements. Announcements requested in the OC-Play-Announcement-Id AVP are played if no Announcement-Information announcements are present and configured announcement IDs for out-of-credit (4012 CCA result code) or low balance (Low-Balance-Indicator AVP) are only played if no Announcement-Information or OC-Play-Announcement-Id AVPs were present.

Call phase Announcement-Information AVP Low Balance Indicator AVP 4012 Out-of- Credit Behaviour

Early media

Present

Not present

Not present

Charging announcement played, call continues

Early media

Present

Present

Not present

Charging announcement played, call continues (configured low balance announcement not played)

Early media

Present

Not present

Present

Charging announcement played, call ends

Early media

Not present

Present

Not present

Low balance feature configured announcement played, call continues

Early media

Not present

Present

Present

Out of credit feature configured announcement played, call ends

Mid call

Present

Not present

Not present

Charging announcement played, call continues

Mid call

Present

Present

Not present

Charging announcement played, call continues (configured low balance announcement not played)

Mid call

Present

Not present

Present

Charging announcement played, call ends

Mid call

Not present

Present

Not present

Low balance feature configured announcement played, call continues

Mid call

Not present

Present

Present

Out of credit feature configured announcement played, call ends

Announcements for terminating user

It is not possible to play announcements to the terminating subscriber after the initial credit check as the session has not yet been established. Announcements requested by Announcement-Information AVPs to be played to the terminating party in the initial credit check are not played. If other announcements were requested when running as a terminating instance then a reauthorization request will be sent once the session is established. Any announcements in the response to this subsequent reauthorization request will be played. The reauthorization request can be delayed for a number of milliseconds using the ChargingReauthDelayMillis configuration field.

Mid call announcements to the terminating subscriber will be played immediately.

Charging Announcements

The Announcement-Information AVP and its child AVPs were introduced in 3GPP Rel. 13 but Sentinel does support receiving them in Rel. 12.

Child AVP Behaviour 
Announcement-Identifier

Contains the ID for the announcement. This must be present and non-zero.

 
Variable-Part

Ignored

 
Time-Indicator

If present and non-zero a timer will be set relative to quota exhaustion and the announcement scheduled on timer expiry. If zero the announcement will be scheduled once the quota is exhausted and the call ended. If a credit check occurs before the timer fires or quota is exhausted then the announcement will not be played. An announcement with Time-Indicator 0 will only be played if the CCA contained a Final-Units-Indication AVP.

 
Quota-Indicator

If present this determines whether the user will be charged for the announcement. If not present, local announcement configuration will be used instead. This is ignored for early media announcements.

 
Announcement-Order

If multiple announcements are set in the CCA this should be used to order them.

 
Play-Alternative

If present determines whether the announcement should be played to the served or remote user. If not present the announcement will be played to the served user. If multiple announcements are present only announcements to the party with the lowest Announcement-Order will be played.

 
Privacy-Indicator

Ignored. The announcement is only to the requested party.

 
Language

If present this will be used in the request to the MRF, otherwise the determined language will be used.

Low Balance Announcements

If the LowBalanceIndicator AVP is set in a successful CCA-I or CCA-U then a low balance announcement will be played (either configured or via the OC-Play-Announcement-Id-AVP) and a session state field is set to mark that a low balance announcement has been played. Subsequent credit checks will not trigger another low balance announcement unless the previous credit check response did not have the LowBalanceIndicator AVP set.

Out of Credit Announcements

If a credit check response contains a 4012 result code then:

  • For early originating sessions, the feature will schedule the configured early dialog announcement if an announcement was not supplied in the CCA and then end the session with the appropriate sip error response according to the CCA result code.

  • For early terminating and forwarding sessions, the feature will not schedule an announcement and will end the session with a 480 Temporarily Unavailable response.

  • For confirmed originating and terminating sessions, the feature will schedule the configured mid session announcement if an announcement was not supplied in the CCA and then end the session.

Session state input variables

Attribute Name Type 
LatestOcsAnswer

org.jainslee.resources.diameter.ro.types.vcb0.CreditControlAnswer

 
LegForCdrs

String

 
CallType

com.opencloud.sentinel.common.CallType

 
LowBalanceReauthTimerId

javax.slee.facilities.TimerID

Session state output variables

Attribute Name Type Description 
EarlyMediaAnnouncementInfoQueue

List

A List of early dialog announcements to play, if any

 
MidCallAnnouncementInfoQueue

List

A list of the mid call announcements to play, if any

 
EndSessionAfterAnnouncement

int

The Sip response error code for the SipPlayAnnouncement feature to use on endSession.

 
EndSessionWithAnnouncement

boolean

Set to true if session should end after announcement is played.

 
MidCallAnnouncementPlayedParty

String

Leg name indicating which party the announcement will be played to

 
MidCallEndSessionWithAnnouncement

boolean

Set to true if session should end after announcement is played.

 
UserEndSessionCause

int

The Sip response error code to use on endSession, if applicable.

 
LowBalanceAnnouncementPlayed

boolean

Set to true when a low balance announcement has been scheduled. Set to false when a CCA is received without a Low-Balance-Indicator AVP.

 
OcsAnnouncementPlayed

boolean

Set to true when OC-Play-Announcement-Id announcements have been scheduled. Set to false when a new CCA is received.

 
AnnouncementTimersMapping

Map

A map of TimerID to the SipAnnouncementInformation to be scheduled on the timer firing.

 
AnnouncementTimersPostponed

Boolean

Set to true if the initial CCA requested an announcement to be played on a timer.

Configuration

SetOcsAnnouncementID uses two JSLEE configuration profile tables: LowBalanceAnnouncementConfigProfileTable and SetOutOfCreditAnnouncementIDConfigProfileTable.

Attribute Name Profile Table Type Description 
EarlyDialogLowBalanceAnnouncementID

LowBalanceAnnouncementConfigProfileTable

int

The ID of the early dialog announcement to play, if any

 
MidSessionLowBalanceAnnouncementID

LowBalanceAnnouncementConfigProfileTable

int

The ID of the mid call announcement to play, if any

 
ChargingReauthDelayMillis

LowBalanceAnnouncementConfigProfileTable

long

When a terminating call is ACKed and the latest CCA indicates a low balance, a delayed credit check will be performed to postpone playing an announcement. The reauth will be delayed by the amount specified here (0 triggers an immediate reauth.) This allows time for the ACK to propagate through the network to ensure the played party is fully connected before triggering the announcement after receiving another CCA-U with low balance indicator.

 
OutOfCreditAnnouncementID

SetOutOfCreditAnnouncementIDConfigProfileTable

int

The ID of the early dialog announcement to play, if any

 
MidSessionOutOfCreditAnnouncementID

SetOutOfCreditAnnouncementIDConfigProfileTable

int

The ID of the mid call announcement to play, if any

Statistics

SetOcsAnnouncementID statistics are tracked by the SetOcsAnnouncementID feature and can be found under the following parameter set:
SLEE-Usage ▶ sentinel.volte.sip service ID ▶ sentinel.volte.sip SBB ID ▶ SetOcsAnnouncementID.

Name Type Description 
Started

Counter

Incremented each time the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
InvalidExecutionPoint

Counter

Incremented whenever the feature is invoked in an invalid execution point. Indicates misconfigured feature scripts.

 
IgnoringRepeatLowBalance

Counter

The feature will not trigger a second announcement for ongoing low balance indicators.

 
ClearLowBalancePlayed

Counter

If a CCA is received with no low balance indicator, any subsequent low balance will trigger another announcement.

 
StartReauthTimer

Counter

Incremented when a terminating call is ACKed but the latest CCA indicates an announcement is requested.

 
LowBalanceReauthTimerEventReceived

Counter

Incremented whenever a reauthorization timer event is received.

 
DoCreditReauth

Counter

Incremented whenever the feature issues a credit reauth.

 
ScheduledOcPlayAnnouncementId

Counter

Incremented whenever an OC-Play-Announcement-Id announcement is enqueued.

 
EarlyDialogLowBalanceAnnouncementIDSet

Counter

Incremented whenever a configured early media Low Balance Announcement ID is enqueued.

 
MidSessionLowBalanceAnnouncementIDSet

Counter

Incremented whenever a configured mid call Low Balance Announcement ID is enqueued.

 
EarlyDialogOutOfCreditAnnouncementIDSet

Counter

Incremented whenever a configured early media Out of Credit Announcement ID is enqueued.

 
MidSessionOutOfCreditAnnouncementIDSet

Counter

Incremented whenever a configured mid call Out of Credit Announcement ID is enqueued.

 
EndSessionCauseSet

Counter

Incremented whenever a session is terminated due to running out of credit.

 
NoOutOfCreditAnnouncementID

Counter

Incremented whenever an early media Out of Credit Announcement cannot be played as there is no configured announcement ID.

 
NoMidSessionOutOfCreditAnnouncementID

Counter

Incremented whenever a mid call Out of Credit Announcement cannot be played as there is no configured announcement ID.

 
UnableToDetermineEndSessionCause

Counter

Incremented whenever the end of session cause code could not be determined.

 
MissingLegForCdrs

Counter

Incremented whenever the leg to play announcements too could not be determined.

 
ScheduledAnnouncementInformation

Counter

Incremented whenever an Announcement-Information AVP announcement is scheduled.

Provisioning interfaces

The feature is provisioned using the Sentinel REST API or web interface.

StripPreconditions

This feature optionally strips preconditions information from initial INVITEs .

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

Any and All

No

Terminating

MMTel_Post_SipAccess_SubscriberCheck, MMTel_Post_SipAccess_PartyResponse, SCC_Post_SipAccess_SubscriberCheck, SCC_Post_SipAccess_PartyResponse

Yes

No

Stateless

POJO

Behaviour

When SIP forking occurs, this may cause issues with upstream devices that cannot properly handle preconditions negotiation on multiple early dialogs. If this is a problem, then this can be worked around by stripping preconditions from the initial INVITE, if requested by another feature that is performing SIP forking. The StripPreconditions feature detects whether any other features have requested this behaviour, and removes preconditions from the outbound initial INVITE.

The StripPreconditions feature works as follows.

Features that execute prior to the StripPreconditions feature add legs to a session state variable variable called StripPreconditionsLegNames. Currently only MMTelParallelFA and SCCTADSParallelRouting features add legs to the collection, although any custom feature is permitted to add legs. When the StripPreconditions feature runs, it checks the StripPreconditionsLegNames session state variable and performs the following.

  • check if feature’s EnabledFlag is true. If not selected the feature ends

  • strip precondition attributes a=curr, a=des, and a=conf from the SDP of the INVITE. If there are no attributes to strip the feature ends.

  • strip the "preconditions" option tag in the Supported header from the INVITE

The feature supports the removal of preconditions from initial INVITEs and retarget INVITEs.

Prerequisite features

The feature must run before SDPMonitor mode "post" and DiameterPerLegInfo features.

Session state input variables

Variable name Variable type Description 
StripPreconditionsLegNames

Set<String>

Collection of leg names that will have preconditions information stripped from initial INVITEs.

Session state output variables

None.

Network operator data

This feature reads the EnabledFlag in the feature configuration profile table StripPreconditions to determine if the feature will strip preconditions.

Parameter Type Description Default 
EnabledFlag

boolean

true or false

false

Statistics

StripPreconditions statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → StripPreconditions
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.StripPreconditions"

Name Type Description 
Started

Counter

Incremented each time the feature runs

 
FailedToStart

Counter

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Counter

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Counter

Incremented when a fatal error occurs during feature execution

 
TimedOut

Counter

Incremented when feature execution does not complete within a reasonable time frame

 
RemovePreconditionsFields

Counter

Incremented when the feature strips preconditions attributes from INVITE SDP

 
InviteNotFoundInQueue

Counter

Incremented when the feature is unable to find the INVITE from an internal system queue

 
MessageQueueEmpty

Counter

Incremented when the feature is unable to find any SIP messages from an internal system queue

 
InvalidSDP

Counter

Incremented when the feature fails to parse the SDP

Values examined

Value Name Source Notes

StripPreconditionsLegNames

Session State

Collection of leg names that will have preconditions stripped. The collection can be updated by any feature that has access to the session state variable StripPreconditionsLegNames. Currently the MMTelParallelFA and SCCTADSParallelRouting features add legs to the collection.

SDP

Outgoing INVITE request

Check if precondition attributes a=curr, a=des, and a=conf are present in the SDP of the INVITE. If yes strip, if no then don’t execute any further.

Supported Header

Outgoing INVITE request

Remove 'preconditions' option tag from the Supported header unless there are no preconditions attributes present in the SDP.

SubscriberDataLookupFromHLR

SubscriberDataLookupFromHLR is responsible for reading subscriber data from the HLR and writing it into Sentinel session state variable fields.

The data it reads from the HLR is accessed through the AnyTimeSubscriberInterrogation MAP operation. The Application Context used is anyTimeInfoHandlingContext_v3_ac

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature Other notes

Both or either of MMTEL or SCC.

No

Originating, Forwarding, and Terminating

SipAccess_SubscriberPreCreditCheck

Yes

Yes

Stateless

POJO

Prerequisite features

Configuration

The feature uses the HLRConfigProfileTable to access its configuration. For more information refer to HLR MAP Configuration.

Statistics

SubscriberDataLookupFromHLR statistics are tracked by the SubscriberDataLookupFromHLR feature and can be found under the following parameter set: SLEE-Usage → sentinel.volte.sip service ID → SubscriberDataLookupFromHLR.

Name Type Description 
Started

Counter

Incremented each time the feature runs

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution

 
RequestSent

Counter

Incremented when the feature receives subscriber data from the HLR

 
RequestSuccessful

Counter

Incremented after the feature successfully processes the data it received, and loads it into session state fields

 
RequestFailed

Counter

Incremented when absent configuration data prevents the feature from running

 
ResponseLatency

Sampled

Records elapsed time between sending the request to the HLR and getting a response (in milliseconds).

Behaviour

This feature uses the CGIN MAP RA to access the HLR.

Each time the feature is invoked, it checks the call type and determines the subscriber number that it should use to query the HLR.

The feature attempts to extract "phone number digits" from the Default Public ID, and if it cannot, from any other registered IMS Public User Identity. The first IMS Public User Identity that has "phone number digits" has its digits extracted to form the MSISDN for the AnytimeSubscriptionInterrogation query. If the feature cannot form an MSISDN it raises a Feature Error and finishes execution.

The feature requests the subscriber data by sending a AnyTimeSubscriptionInterrogation request for all Supplementary Services. If the triggering attempt is a terminating trigger, the feature sends two queries in order to gather the Call Forwarding information.

In order to form the ATSI request the feature:

  1. sets the GSM SCF address to the SentinelSCCPAddress configuration value

  2. sets the destination SCCP address to the HlrSCCPAddress configuration value

  3. sets the indicator fields to request CLIP, CLIR, CW, ODB and may request Forwarding information for unconditional forwarding

If the session is a terminating session, a second request is sent where Forwarding information is requested for conditional forwarding.

Once the query(s) are successful, it sets the session state fields for the supplementary services according the mapping below.

Supplementary Service Session State Mappings

GSM Service MMTel Service

CLIP

OIP

COLP

TIP

CLIR

OIR

COLR

TIR

ODB

ICB

ODB

OCB

Call Forwarding

CDIV

Call Waiting

CW

Call Hold

HOLD

GSM ASN.1 Schema to Session-State Fields

The mapping below describes how the AnyTimeSubscriptionInterrogation result is mapped into the MMTel Subscriber Data Representation.

ss-Status ASN.1 field

The field ss-Status is used by almost all supplementary services and defines the service state. Each service defines a set of possible values based on ss-Status, so called State Vectors. A state vector is formed of 4 variables: Provisioning State, Registration State, Activation State and HLR Induction State. This feature only reads the Activation State, i.e. "A and Q" bits.

For more information see 3GPP TS 23.011 - Technical realization of Supplementary Services.

CLIP

ASN.1 Field (From) Session-State Field (To) Mapping Rules

ClipData.ss-Status

MMTelOIPServiceData.active

true if ss-Status=Active and Operative else false.

OverrideCategory

MTelOIPServiceData.override

No default value. It is an obligatory field from HLR response.

CLIR

ASN.1 Field (From) Session-State Field (To) Mapping Rules

ClirData.ss-Status

MMTelOIRServiceData.active

true if ss-Status=Active and Operative else false.

n/a

MMTelOIRServiceData.mode

the same default for IMS OIR

ClirData.CliRestrictionOption

MMTelOIRServiceData.defaultBehaviourType

No default value. It is an obligatory field from HLR response.

COLP

ASN.1 Field (From) Session-State Field (To) Mapping Rules

n/a

MMTelTIPServiceData.active

true.

n/a

MMTelTIPServiceData.override

the same default for IMS TIP

COLR

ASN.1 Field (From) Session-State Field (To) Mapping Rules

n/a

MMTelTIRServiceData.active

true.

n/a

MMTelTIRServiceData.mode

the same default for IMS TIR

ODB - Incoming calls

ASN.1 Field (From) Session-State Field (To) Mapping Rules

n/a

MMTelICBServiceData.active

true.

ODB-Info.ODB-Data.ODB-GeneralData

MMTelICBServiceData.ruleset

see Ruleset Conditions for barring incoming calls

Ruleset Conditions for barring incoming calls

ODB Data Value Condition

allIC-CallsBarred

Unconditional

n/a

Anonymous

roamingOutsidePLMNIC-CallsBarred

Roaming

roamingOutsidePLMNICountryIC-CallsBarred

Roaming and International ExHC

ODB - Outgoing calls

ASN.1 Field (From) Session-State Field (To) Mapping Rules

n/a

MMTelOCBServiceData.active

true

ODB-Info.ODB-Data.ODB-GeneralData

MMTelOCBServiceData.ruleset

see Ruleset Conditions for barring outgoing calls

Ruleset Conditions for barring outgoing calls

ODB Data Value Condition

allOG-CallsBarred

Unconditional

internationalOGCallsBarred

International

internationalOGCallsNotToHPLMN-CountryBarred

International-exHC

roamingOutsidePLMNOG-CallsBarred

Roaming

Call Forwarding

ASN.1 Field (From) Session-State Field (To) Mapping Rules

callForwardingData.forwardingFeatureList[x].ss-Status

MMTelCDIVServiceData.active

true if ss-Status=Active and Operative else false.

callForwardingData.forwardingFeatureList.forwardingOptions

MMTelCDIVServiceData.ruleset

No default value defined.

callForwardingData.forwardingFeatureList.noReplyConditionTime

MMTelCDIVServiceData.noreplytimeout

No default value defined.

Ruleset Conditions for Call Forwarding

ASN.1 value in bits 4 and 3 of Octet 1 of Ext-ForwardOptions Condition 00

Not Reachable

01

Busy

10

No reply

11

Call Waiting

ASN.1 Field (From) Session-State Field (To) Mapping Rules

CallWaitingData.ss-Status

MMTelCWServiceData

true if ss-Status=Active and Operative else false.

Call Hold

ASN.1 Field (From) Session-State Field (To) Mapping Rules

CallHoldData.ss-Status

MMTelHOLDServiceData.active

true if ss-Status=Active and Operative else false.

SubscriberDataLookupFromHSS

SubscriberDataLookupFromHSS is responsible for reading data from the HSS and writing it into Sentinel session state fields.

The data it reads from the HSS must be accessed from TransparentUserData in the HSS.

Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature Other notes

Both or either of MMTEL or SCC

Yes

Originating, Forwarding, and Terminating

SipAccess_SubscriberPreCreditCheck

Yes

Yes

Stateless

SBB

Prerequisite features

Session input variables

Attribute Name Type 
Subscriber

String

 
RegistrationRecords

List<RegistrationRecord>

Configuration

This feature has an out-of-the-box configuration ensuring the MMTel features work. The configuration may be extended to

  • support additional MMTel features that use the MMTel services XML schema

  • support additional features that use a different XML schema

This configuration extensibility is supported through the profile table named ${PlatformOperatorName}_SubscriberDataLookupFromHss2ServiceIndicationProfileTable. If the platform operator name is RocketInc then the profile table name is RocketInc_SubscriberDataLookupFromHss2ServiceIndicationProfileTable.

The profile table contains one profile for each Service Indication that shall be queried in the HSS. Each profile defines:

  1. the Service-Indication

  2. the fully qualified class name of the Transparent Data Codec class - used to parse the returned XML into a Java Object

  3. a list of adaptor class names (fully qualified class names)

  4. an option to enable or disable the query

  5. a default value for operator authorized fields

This table, by default, has entries for MMTEL-Services, IMS-ODB-Information, and Metaswitch-TAS-Services configured. The MMTEL-Services query is enabled by default, while IMS-ODB-Information and Metaswitch-TAS-Services are disabled. The query can be enabled or disabled by setting the value of DisableQuery field to true or false. A value of true disables the query.

Statistics

SubscriberDataLookupFromHss statistics are tracked by the SubscriberDataLookupFromHss2 SBB and can be found under the following parameter set: SLEE-Usage → volte.sentinel.sip service ID → SubscriberDataLookupFromHss2 SBB ID.

Name Type Description 
Invoked

Counter

Incremented each time the feature runs.

 
Failed

Counter

Incremented if a fatal error occurs while the feature is running.

 
SubscriberDataRetrieved

Counter

Incremented when the feature receives subscriber data from the Sh Cache Microservice.

 
SessionStatePopulated

Counter

Incremented after the feature successfully processes the data it received, and loads it into session state fields.

 
AdaptorClassError

Counter

Incremented when Adaptor class is not of type SimservsSessionAdaptor or the feature fails to retrieve adaptor class.

 
CodecClassError

Counter

Incremented when Codec class is not of type ServiceDataCodec or the feature fails to retrieve codec class.

 
Misconfigured

Counter

Incremented when absent configuration data prevents the feature from running.

 
SessionStateNotFound

Counter

Incremented when the session state field the feature requires for operation is missing.

 
ResponseLatency

Sampled

Records elapsed time between sending the request to the HSS and getting a response (in milliseconds).

Behaviour

This feature uses the Sh Cache Microservice RA, connected to the Sh Cache Microservice, to access the HSS.

Each time the feature is invoked, it determines the IMS public identity that it should use to query the HSS.

If the session input variable DefaultPublicID of the first RegistrationRecord in the RegistrationRecords list is present, this field is used as the IMS public identity in the HSS query. Otherwise, the the session input variable subscriber is used as the IMS public identity in the HSS query.

The feature requests the Sh Cache Microservice RA to fetch the transparent user data for the IMS Public Identifier and Service Indication. This data is stored in the corresponding session-state fields.

The feature can be configured to fetch multiple Service Indications, i.e. to retrieve different documents. The out-of-the-box configuration looks for the MMTel Services document.

For each profile in the feature’s configuration

  1. the feature requests the Sh Cache Microservice RA to fetch the transparent user data document

  2. Once a result is available, each adaptor in the list of adaptors is invoked in order to populate session state

MMTel-Services Schema to Session-State Fields

The MMTel-Services schema is configured into this feature in all out-of-the-box installations. This section describes the source of a variable (from within the returned document), and the destination session state field name and attribute for the out-of-the-box configuration.

OIP

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-originating-identity-presentation/originating-identity-presentation/active

MMTelOIPServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-originating-identity-presentation/operator-originating-identity-presentation/restriction-override

MMTelOIPServiceData.override

If not present in the XML document, the field is set to override-not-active according to 3GPP TS 24.607. This is the default from the XML schema.

MMTELServices/complete-originating-identity-presentation/operator-originating-identity-presentation/@authorized

MMTelOIPServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL OIP see MMTelOIP.

OIR

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-originating-identity-restriction/originating-identity-presentation-restriction/active

MMTelOIRServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-originating-identity-restriction/operator-originating-identity-presentation-restriction/mode

MMTelOIRServiceData.mode

If not specified the field is set to temporary according to 3GPP TS 24.607.

MMTELServices/complete-originating-identity-restriction/originating-identity-presentation-restriction/default-behaviour

MMTelOIRServiceData.defaultBehaviourType

If not specified the field is set to presentation-restricted according to 3GPP TS 24.607. This is the default from the XML schema.

MMTELServices/complete-originating-identity-restriction/operator-originating-identity-presentation-restriction/@authorized

MMTelOIRServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL OIR see MMTelOIR.

TIP

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-terminating-identity-presentation/terminating-identity-presentation/active

MMTelTIPServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-terminating-identity-presentation/operator-terminating-identity-presentation/restriction-override

MMTelTIPServiceData.override

If not specified the field is set to override-not-active according to 3GPP TS 24.608. This is the default from the XML schema.

MMTELServices/complete-terminating-identity-presentation/operator-terminating-identity-presentation/@authorized

MMTelTIPServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL TIP see MMTelTIP.

TIR

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-terminating-identity-restriction/terminating-identity-presentation-restriction/active

MMTelTIRServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-terminating-identity-restriction/operator-terminating-identity-presentation-restriction/mode

MMTelTIRServiceData.mode

If not specified the field is set to temporary according to 3GPP TS 24.608. This is the default from the XML schema.

MMTELServices/complete-terminating-identity-restriction/operator-terminating-identity-presentation-restriction/@authorized

MMTelTIRServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL TIR see MMTelTIR.

ICB

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-communication-barring/incoming-communication-barring/active

MMTelICBServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-communication-barring/incoming-communication-barring/ruleset

MMTelICBServiceData.ruleset

No default value specified.

MMTELServices/complete-communication-barring/operator-incoming-communication-barring/@authorized

MMTelICBServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL ICB see MMTelICB.

OCB

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-communication-barring/outgoing-communication-barring/active

MMTelOCBServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-communication-barring/outgoing-communication-barring/ruleset

MMTelOCBServiceData.ruleset

No default value specified.

MMTELServices/complete-communication-barring/operator-outgoing-communication-barring/@authorized

MMTelOCBServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL OCB see MMTelOCB.

CDIV

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-communication-diversion/communication-diversion/active

MMTelCDIVServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-communication-diversion/communication-diversion/NoReplyTimer

MMTelCDIVServiceData.noReplyTimeOut

The default value is specified in Network operator data for MMTEL CDIV CDIVNoReplyTimeout.

MMTELServices/complete-communication-diversion/communication-diversion/ruleset

MMTelCDIVServiceData.rules

No default value specified.

MMTELServices/complete-communication-diversion/operator-communication-diversion/@authorized

MMTelCDIVServiceData.operatorAuthorized

Value read from Configuration

Ruleset Conditions for CDIV. Ruleset is a collection of rules.

XPath in document (From) Session-State Field (To) Default values

MMTELServices/common-policy/conditions

MMTelCDIVServiceData.rules[].conditions

No default value specified.

MMTELServices/complete-communication-diversion/forward-to

MMTelCDIVServiceData.rules[].forwardToAction

No default value specified.

For more information on MMTEL CDIV see MMTelCDIV.

CONF

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-conference/operator-conference/@authorized

MMTelCONFServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL CONF see MMTel Conference.

CW

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-communication-waiting/communication-waiting/active

MMTelCWServiceData.active

If not present in the XML document, the field is set to true according to 3GPP TS 24.623.

MMTELServices/complete-communication-waiting/operator-communication-waiting/@authorized

MMTelCWServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL CW see MMTelCW.

HOLD

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-communication-hold/operator-communication-hold/@authorized

MMTelHOLDServiceData.operatorAuthorized

Value read from Configuration

For more information on MMTEL Hold see MMTelHold.

Flexible-Alerting

XPath in document (From) Session-State Field (To) Default values

MMTELServices/complete-flexible-alerting/operator-flexible-alerting-group/group-type

MMTelFAGroup

single-user or multiple-users.

MMTELServices/complete-flexible-alerting/operator-flexible-alerting-group/membership

MMTelFAMembership

demand or permanent.

MMTELServices/complete-flexible-alerting/operator-flexible-alerting-group/members

MMTelFAServiceData.members[]

No default value.

MMTELServices/complete-flexible-alerting/operator-flexible-alerting-group/identity

MMTelFAServiceData.identity

The Pilot Number. No default value.

MMTELServices/complete-flexible-alerting/operator-flexible-alerting-group/@authorized

MMTelFAServiceData.authorized

Value read from Configuration

For more information on MMTEL FA see Flexible Alerting.

ECT

XPath in document (From) Session-State Field (To) Default values

MMTelServices/complete-explicit-communication-transfer/operator-explicit-communication-transfer/@authorized

MMTelECTServiceData.authorized

Value read from Configuration

For more information on MMTEL ECT see MMTelECT

IMS-ODB-Information Schema to Session-State Fields

The IMS-ODB-Information schema is configured (but disabled) into this feature in all out-of-the-box installations. This section describes the source of a variable (from within the returned document), and the destination session state field name and attribute for the out-of-the-box configuration.

Operator Determined Barring

For more information see Operator Determined Barring.

Metaswitch-TAS-Services Schema to Session-State Fields

The Metaswitch-TAS-Services schema is configured (but disabled) into this feature in all out-of-the-box installations. This section describes the source of a variable (from within the returned document), and the destination session state field name and attribute for the out-of-the-box configuration.

Basic Services

XPath in document (From) Session-State Field (To) Default values

Metaswitch-Services/basic-settings/additional-attributes

MetaswitchBasicSettings.additionalAttributes

If not present in the XML document, the field is set to an empty map.

Location Based Dialling

XPath in document (From) Session-State Field (To) Default values

Metaswitch-Services/location-based-dialling/group-id

MetaswitchLocationBasedDialling.groupId

If not present in the XML document, the field is set to null

Metaswitch-Services/basic-settings/additional-attributes

MetaswitchLocationBasedDialling.additionalAttributes

If not present in the XML document, the field is set to an empty map.

For more information on location based dialling see Location Based Dialling

Forward To Voicemail

XPath in document (From) Session-State Field (To) Default values Notes

metaswitch-services/complete-forward-to-voicemail/forward-to-voicemail/voicemail-server

MetaswitchForwardToVoicemail.voicemailServer

If not present in the XML document, the field is set to null.

metaswitch-services/complete-forward-to-voicemail/forward-to-voicemail/additional-attributes AND Metaswitch-Services/complete-forward-to-voicemail/operator-forward-to-voicemail/additional-attributes

MetaswitchForwardToVoicemail.additionalAttributes

If not present in the XML document, the field is set to an empty map of String → String.

Where there is an attribute with the same name in the operator and user sections of the document, the value in the user section takes precedence.

metaswitch-services/complete-forward-to-voicemail/forward-to-voicemail/active

MetaswitchForwardToVoicemail.active

If not present in the XML document, the field is set to null.

For more information on forwarding to voicemail see:

Companion Device

XPath in document (From) Session-State Field (To) Default values Notes

metaswitch-services/complete-companion-device/companion-device/@active

CompanionDeviceData.active

true

metaswitch-services/complete-companion-device/operator-companion-device/@authorized

CompanionDeviceData.operatorAuthorized

Value read from Configuration

metaswitch-services/complete-companion-device/operator-companion-device/radio-access

CompanionDeviceData.radioAccess

If not present in the XML document, the field is set to null.

Value is a <network> element as shown in the RadioAccess type. See example below.

metaswitch-services/complete-companion-device/operator-companion-device/msisdn

CompanionDeviceData.msisdn

If not present in the XML document, the field is set to null.

metaswitch-services/complete-companion-device/operator-companion-device/additional-attributes AND metaswitch-services/complete-companion-device/companion-device/additional-attributes

CompanionDeviceData.additionalAttributes

If not present in the XML document, the field is set to an empty map of String → String.

Where there is an attribute with the same name in the operator and user sections of the document, the value in the user section takes precedence.
Example Radio Access field value
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<radio-access xmlns="http://metaswitch.com/XMLSchema/tas">
  <network>PS</network>
</radio-access>

For more information on companion device support, see Companion Devices.

SuppressSdpCdr

SuppressSdpCdr is a system feature which prevents SDP-change initiated CDRs from being written by the VolteInterimCdr feature for non-roaming Mobile Terminating calls.

Statistics

SuppressSdrCdr statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → SuppressSdpCdr
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.SuppressSdpCdr"

Name Type Description 
Started

Counter

Incremented each time the feature runs.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
NoPendingSdpCdr

Counter

Incremented when the feature runs but there is no pending SDP CDR to suppress

 
SdpCdrWriteSuppressed

Counter

Incremented each time an SDP CDR is suppressed

 
SdpCdrWriteAllowed

Counter

Incremented each time the feature runs but doesn’t suppress a pending SDP CDR

Functionality

This feature uses information available in session state to suppress interim CDRs from being written in response to SDP changes for non-roaming Mobile Terminating calls. The mechanism it uses to suppress the CDRs from being written by the VolteInterimCdr feature is to unset the WriteCdrOnSDPChange session state field.

When this feature runs, if the session state variable RoamingIndicator is False, and CallType is MobileTerminating, the WriteCdrOnSDPChange session state field will be set to False.

VoLTE Interim CDR Feature

VolteInterimCdr is a system feature that is responsible for writing interim Call Detail Records and/or Diameter Accounting Requests (ACRs) throughout the session.

VolteInterimCdr runs at various key points throughout a session and if any of its write conditions are met it writes either, both, or neither of:

  1. an interim AVP CDR using the cdr-ra

  2. an ACR using the rf-control-ra

Interim AVP CDRs and Diameter Accounting Records (ACRs) have substantially similar content and the same triggering logic hence both are supported by this feature.

Tip

By default, Sentinel runs VolteInterimCdr as the very last feature in the post phase of almost every Sip or Charging related feature execution script and EndSession. For example:

featurescript SipEndSession-SysPost-Default {
    run VolteInterimCdr
    run MaxCallDuration
    run SessionRefresh
}

Details

Feature script name

VolteInterimCdr

Applicable contexts

SIP service

SAS Support

No

Prerequisite features

None, but information from various features is used if available

Session state inputs and outputs

Inputs

If any of these fields are unset the feature will skip writing the current CDR/ACR.

This feature uses the same session state fields as the Sentinel Interim CDR feature. This page will only discuss the additions to the fields described there.

Name Type Description Where set

TerminatingDomain

String

The accepted terminating domain in a T-ADS scenario

MMTelWifiChargingFinalisation feature, SCCTADSParallelRouting feature

MMTelInformation

org.jainslee.resources.diameter .ro.types.vcb0.MmtelInformation

The MMTel-Information Diameter AVP

DiameterMMTelInfo feature

RegistrationRecords

List<com.opencloud.sentinel.state.RegistrationRecord>

Contains subscriber information retrieved from the Registrar and HSS or Cassandra

IMSIDLookup feature, IMSIDLookupFromCassandraSIP feature

CallReferenceNumber

byte[]

Contains the Call Reference Number used in queries to the HLR

FetchMSRN feature

Functionality

This feature can be configured to:

  • write CDRs to the local filesystem (through the cdr-ra), and/or

  • write ACRs using the Diameter Rf protocol (through the rf-control-ra)

  • not write either

This feature uses the information from the session state fields mentioned above and constructs a CDR and/or ACR for output. See AVP CDR Format for the format of the CDRs.

Although the feature runs in many execution points, it inspects various session state fields to decide whether or not to write an interim CDR and/or ACR.

An interim CDR and/or ACR will be written under any of the following conditions:

  • On the initial SIP request on the 'LegForCdrs'

  • On the SipInterimCdr feature timer, if no CDR has been recently written

  • On session end

  • When a feature (e.g. SDP Monitor) sets WriteCdrOnSDPChange to true

When the VoLTE TAS is configured for session replication CDRs will still be written and ACRs will continue to be sent after node failover. The feature maintains a timer for the interim CDR period. This timer may be adjusted according to the Rf accounting interval provided by the CDF. The interim CDR timer is armed redundantly if session replication is enabled.

When the feature is about to write an INTERIM or STOP ACR for a Sentinel Session, if checks if the current Rhino node has an Rf Control Activity for the Diameter Rf session. If it does not, a new Rf Control Activity is started using the same Rf session identifier. This fails over the Rf session. The new session will use `Accounting-Record-Number`s continuing from the last known record number before failover.

Also see Charging Information for general information about the contents of CDRs, ACRs and CCRs.

Note This feature only supports writing binary CDRs. If the cdr-ra is configured to write text CDRs the feature will fail to execute.

Configuration

These parameters configure the feature:

Parameter Type Description

WriteCdrOnSDPChange

boolean

When a meaningful SDP change occurs on a monitored leg, write a CDR

InterimTimerPeriod

long

The maximum duration in seconds between timer driven interim CDRs. Setting this to zero will disable timer based interim CDRs.

UseCdrRa

boolean

Whether interim CDRs should be written to disk using the cdr-ra

UseRfControlRa

boolean

Whether ACRs should be written using the rf-control-ra

Configuration profile naming

Configuration Profile Table Name Description Profile Naming

SipInterimCdrProfileTable

SipInterimCdr feature configuration parameters

SentinelSelectionKey (typically $PLATFORM_OPERATOR_NAME:::: for example, OpenCloud::::)

Feature responses

Response Reason

featureHasFinished

feature has finished

VoLTE Network KPI Feature

The VoLTE Network KPI feature (VolteNetworkKPI) increments the "Call Success" and "Post Dial Delay" counters, which you can combine with other stats to gauge network traffic.

Feature Cheat Sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

SCCOrig, SCCTerm, MMTelOrig, MMTelTerm

No

Originating and Terminating

MMTel_Post_SipEndSession, SCC_Post_SipEndSession

Yes

No

Stateless

POJO

Prerequisite features

You must run these features before VolteNetworkKPI:

Behaviour

The VolteNetworkKPI feature is used to increment the "Call Success" and "Post Dial Delay" counters. The feature uses information collected by Sentinel during the call session to increment the relevant counters in the SipEndSession execution point.

Call Success

Call Success is determined by comparing the initial INVITE final response code with a list of "Success" codes. The term success is from the perspective of Sentinel VoLTE where it has "successfully" processed the call according to a list of response codes.

The default list of response codes is

SuccessResponseCodes: [200,486,487,404,603]

Internally the VolteNetworkKPI feature uses the value set in the DetermineCauseCode feature that in turn uses the final response code from the downstream leg, or an error code in case of an internal error.

Note

The VolteNetworkKPI feature doesn’t support the filtering of Success responses. For example, the Operator may wish to filter 486 responses from the Success counter if it originates from a specific network element. This is currently not possible.

The VolteNetworkKPI feature further categorizes calls into 'onNet' and 'Unknown'. If the call is triggered in SCC-Orig or MMTel-Orig then the feature checks if OC-Terminating-Domain header is present via isOCTerminatingHeaderPresent flag. If the flag is present, then the call is considered onNet.

If the flag isOCTerminatingHeaderPresent is false, or the feature is executed in the MMTel-Term or SCC-Term, then InterOperatorIdentifier sessionState’s OriginatingInterOperatorIdentifier (orig-ioi) and TerminatingInterOperatorIdentifier (term-ioi) are evaluated. A call is considered onNet if both the orig-ioi and term-ioi values are the home plmn (via PLMNAnalyser). Otherwise, the call is Unknown.

Success Example

  • 486 is configured as a success response code.

  • Home network VoLTE subscriber calls a non VoLTE subscriber, which triggers a SCC-Orig plan on Sentinel VoLTE.

  • The non VoLTE subscriber returns a 486.

  • The DetermineCauseCode feature sets the cause code to -486.

  • The VolteNetworkKPI feature increments KPISccOrigUnknownSuccess and KPISccOrigUnknownAttempt due to

    • 486 is a success response code.

    • The onNet status is unknown as there is no OC-Terminating-Domain header and no location information that is orig-ioi and term-ioi is present in P-Charging-Vector header.

Non Success Example

  • 404 is not configured as a success response code.

  • A non VoLTE subscriber calls a home network VoLTE subscriber calls a non VoLTE subscriber, which triggers a MMTel-Term plan on Sentinel VoLTE.

  • The home network VoLTE subscriber returns a 404.

  • The DetermineCauseCode feature sets the cause code to -404.

  • The VolteNetworkKPI feature increments KPIMMTelTermUnknownAttempt due to.

    • 404 is not a success response code.

    • The onNet status is unknown as there is location information present in the P-Charging-Vector header, but orig-ioi indicates it’s a non-home network.

Post Dial Delay

Post Dial Delay is the time difference between the initial INVITE (sessionInitiated) and the first 180 Ringing or ACK (sessionEstablished). The VolteNetworkKPI feature uses these values to calculate the delay and then increment the time interval counters.

Note

Provisional 183 messages are not considered as they are used as part of Precondition negotiations. This means if a 183 is used to play early media that is a network announcement, then it is not part of Post Dial Delay calculation.

Post Dial Delay is calculated in SCCOrig, MMTelOrig, MMTelTerm, and SCCTerm execution points. Therefore an onNet call could potentially increment four time interval counters, one for each planId.

The counter uses the format postDialDelay<planId><time interval counter>. So for example if a 180 is received in the SCCOrig execution point 1400 ms after the session is initiated, then the postDialDelaySCCOrig1000to1500ms counter is incremented.

Session state inputs and outputs

Inputs

Name Type Format Description Behaviour if null/invalid

SentinelSelectionKey

SentinelSelectionKey

selection key + for example, <platform>::::

For selecting 'success' response codes from VolteNetworkKPIProfileTable. For example SuccessResponseCodes: [ 200,486,487,404,603]. Also used for determining the planId, for example SCCOrig

Increment InputParameterErrors common cleanup actions

DiameterCauseCode

Integer

null or a integer

Either final SIP response code or internal error set by the DetermineCauseCode feature.

If the value is null, the VolteNetworkKPI feature doesn’t increment any success counter.

InitialRingingResponseTimestamp

Long

null or a long

Timestamp recorded by the RecordTimestamps feature on first 180 Ringing.

If the value is null, the VolteNetworkKPI feature doesn’t increment any time bucket.

SessionEstablished

long

0 or non 0

Timestamp recorded by the B2BUA feature when on ACK is received from the Calling Party.

If 0, the VolteNetworkKPI feature doesn’t increment any time bucket.

SessionInitiated

long

0 or non 0

Timestamp recorded by Sentinel when an initial INVITE is received from the Calling Party.

If 0, the VolteNetworkKPI feature doesn’t increment any time bucket.

OriginatingInterOperatorIdentifier

String

null or String

orig-ioi parameter extracted from the P-Charging-Vector header. This is used to help determine if the call is onNet.

If the value is null, the VolteNetworkKPI feature doesn’t use this to determine onNet.

TerminatingInterOperatorIdentifier

String

null or String

term-ioi parameter extracted from the P-Charging-Vector header. This is used to help determine if the call is onNet.

If the value is null, the VolteNetworkKPI feature doesn’t use this to determine onNet.

Outputs

Name Type Format Description Behaviour if null/invalid

IsCallSuccessKPISet

boolean

true or false

true if the Call Success KPI is set.

Initially set to false

IsPostDialDelayKPISet

boolean

true or false

true if the Post Dial Delay KPI is set.

Initially set to false

Statistics

VolteNetworkKPI statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set:
SLEE-Usage → sentinel.volte.sip service ID → sentinel.volte.sip SBB ID → feature.VolteNetworkKPI

Name Type Description

kPISccOrigOnNetAttempts

counter

Incremented on every 'onNet' SCCOrig call.

kPISccOrigOnNetSuccess

counter

Incremented on 'success' 'onNet' SCCOrig call.

kPISccOrigUnknownAttempts

counter

Incremented on every 'unknown' SCCOrig call.

kPISccOrigUnknownSuccess

counter

Incremented on 'success' 'unknown' SCCOrig call.

kPIMmtelTermOnNetAttempts

counter

Incremented on every 'onNet' MMTelTerm call.

kPIMmtelTermOnNetSuccess

counter

Incremented on a 'success' 'onNet' MMTelTerm call.

kPIMmtelTermUnknownAttempts

counter

Incremented on every 'unknown' MMTelTerm call.

kPIMmtelTermUnknownSuccess

counter

Incremented on every 'unknown' 'success' MMTelTerm call.

postDialDelayMMTelOrig0to500ms

counter

Incremented if the delay ⇐ 500 ms.

postDialDelayMMTelOrig501to1000ms

counter

Incremented if the delay > 500 ms and ⇐ 1000 ms.

postDialDelayMMTelOrig1001to1500ms

counter

Incremented if the delay > 1000 ms and ⇐ 1500 ms.

postDialDelayMMTelOrig1501to2000ms

counter

Incremented if the delay > 1500 ms and ⇐ 2000 ms.

postDialDelayMMTelOrig2001to2500ms

counter

Incremented if the delay > 2000 ms and ⇐ 2500 ms.

postDialDelayMMTelOrig2501to3000ms

counter

Incremented if the delay > 2500 ms and ⇐ 3000 ms.

postDialDelayMMTelOrigOver3000ms

counter

Incremented if the delay > 3000

postDialDelayMMTelTerm0to500ms

counter

Incremented if the delay ⇐ 500 ms.

postDialDelayMMTelTerm501to1000ms

counter

Incremented if the delay > 500 ms and ⇐ 1000 ms.

postDialDelayMMTelTerm1001to1500ms

counter

Incremented if the delay > 1000 ms and ⇐ 1500 ms.

postDialDelayMMTelTerm1501to2000ms

counter

Incremented if the delay > 1500 ms and ⇐ 2000 ms.

postDialDelayMMTelTerm2001to2500ms

counter

Incremented if the delay > 2000 ms and ⇐ 2500 ms.

postDialDelayMMTelTerm2501to3000ms

counter

Incremented if the delay > 2500 ms and ⇐ 3000 ms.

postDialDelayMMTelTermOver3000ms

counter

Incremented if the delay > 3000

postDialDelaySCCOrig0to500ms

counter

Incremented if the delay ⇐ 500 ms.

postDialDelaySCCOrig501to1000ms

counter

Incremented if the delay > 500 ms and ⇐ 1000 ms.

postDialDelaySCCOrig1001to1500ms

counter

Incremented if the delay > 1000 ms and ⇐ 1500 ms.

postDialDelaySCCOrig1501to2000ms

counter

Incremented if the delay > 1500 ms and ⇐ 2000 ms.

postDialDelaySCCOrig2001to2500ms

counter

Incremented if the delay > 2000 ms and ⇐ 2500 ms.

postDialDelaySCCOrig2501to3000ms

counter

Incremented if the delay > 2500 ms and ⇐ 3000 ms.

postDialDelaySCCOrigOver3000ms

counter

Incremented if the delay > 3000

postDialDelaySCCTerm0to500ms

counter

Incremented if the delay ⇐ 500 ms.

postDialDelaySCCTerm501to1000ms

counter

Incremented if the delay > 500 ms and ⇐ 1000 ms.

postDialDelaySCCTerm1001to1500ms

counter

Incremented if the delay > 1000 ms and ⇐ 1500 ms.

postDialDelaySCCTerm1501to2000ms

counter

Incremented if the delay > 1500 ms and ⇐ 2000 ms.

postDialDelaySCCTerm2001to2500ms

counter

Incremented if the delay > 2000 ms and ⇐ 2500 ms.

postDialDelaySCCTerm2501to3000ms

counter

Incremented if the delay > 2500 ms and ⇐ 3000 ms.

postDialDelaySCCTermOver3000ms

counter

Incremented if the delay > 3000

Configuration

The VolteNetworkKPIProfileTable profile table stores SIP response codes that determine whether the call was a Success.

Parameter Type Description

SuccessResponseCodes

Integer[]

A list of SIP response codes

An example DefinitelyNotOpenCloud:::: profile:

SuccessResponseCodes: [200,486,487,404,603]
Note

The VolteNetworkKPI feature doesn’t include a configuration page in the Rhino Element Manager feature configuration section. The VolteNetworkKPIProfileTable is maintained through either the Rhino management console, or in the Rhino Element Manager Profiles section, which is part of the Management menu. ===

= VoLTE SIP AVP CDR Feature :toc: macro :toclevels: 4 :toc-title: On this page…​

This feature is responsible for building a Call Detail Record that reflects the actions taken whilst processing a session.

It runs once when a session is ending and creates a CDR based on information gathered from session state, and then writes it out using the cdr-ra.

By default, Sentinel runs VolteSipAvpCdr in the post SIP end session feature execution script. For example:

featurescript SipEndSession-SysPost-Default {
    run VolteSipAvpCdr
    run MaxCallDuration
    run SessionRefresh
}

== Details

Feature script name

VolteSipAvpCdr

Applicable contexts

SIP service

SAS Support

No

Prerequisite features

None, but information from various features is used if available

== Session state inputs and outputs

=== Inputs

If any of these fields are unset the feature will skip writing them to the CDR file.

This feature uses the same session state fields as the Sentinel SIP AVP CDR feature. This page will only discuss the additions to the fields described there.

Name Type Description Where set

TerminatingDomain

String

The accepted terminating domain in a T-ADS scenario

MMTelWifiChargingFinalisation feature, SCCTADSParallelRouting feature

MMTelInformation

org.jainslee.resources.diameter .ro.types.vcb0.MmtelInformation

The MMTel-Information Diameter AVP

DiameterMMTelInfo feature

RegistrationRecords

List<com.opencloud.sentinel.state.RegistrationRecord>

Contains subscriber information retrieved from the Registrar and HSS or Cassandra

IMSIDLookup feature, IMSIDLookupFromCassandraSIP feature

CallReferenceNumber

byte[]

Contains the Call Reference Number used in queries to the HLR

FetchMSRN feature

== Functionality

This features uses the information from the session state fields mentioned above and constructs a protobuf message out of it for output. See AVP CDR Format for the format of these messages.

Also see Charging Information for general information about the contents of CDRs and CCRs.

Note This feature only supports writing binary CDRs. If the cdr-ra is configured to write string CDRs the feature will fail to execute.

== Feature responses

Response Reason

featureHasFinished

feature has finished

= MMTel Features :indexpage: :sortorder: 30

These features are MMTel specific.

Feature What it does

MMTel Subscriber Data Representation

a logical representation of supplementary service data as a group of POJO objects. It allows MMTel services/features to execute independently of any concrete schema for the supplementary service data. Therefore it can be loaded from the HSS or the HLR using the MMTel-Services XML schema or 3GPP MAP ASN.1 schema.

MMTel Conference

lets users create multi-party sessions between two or more parties

MMTel Conference View Update

manages writing the conference view state to Cassandra DB for consumption by the MMTel Conference Subscription feature.

MMTel Conference Subscription

provides a means for UEs to subscribe to “conference” event package notifications for a conference

MMTelCDIV

enables a ‘diverting user’ to divert communications addressed to the ‘diverting user’ to another destination

MMTelCW

lets a UE be informed that no resources are available for an incoming communication

MMTelHold

lets a user suspend reception of the media stream(s) of an established IP multimedia session, and resume the media stream(s) at a later time

MMTelICB

implements incoming communication barring and anonymous communication rejection

MMTelOCB

implements outgoing communication barring and operator determined retargeting

Operator Determined Barring

provides call barring rules determined by the operator that take precedence over MMTelICB and MMTelOCB

MMTelOIP

implements the Originating Identification Presentation (OIP) service

MMTelOIR

implements the Originating Identification Restriction (OIR) service

MMTelTIP

implements the Terminating Identification Presentation (TIP) service

MMTelTIR

implements the Terminating Identification Restriction (TIR) service

MMTelWifiChargingFinalisation

handles the finalisation of charging when a call is answered over WiFi.

Diameter MMTel Information

records charging information about MMTel supplementary services invoked on a call.

MMTel Determine Flexible Alerting Mode

determines if and how the Flexible Alerting features will execute based on feature configuration and the HSS Subscriber Data.

MMTelParallelFA

implements the Flexible Alerting service, by alerting the group members in parallel

MMTelSequentialFA

implements the Flexible Alerting service, by sequentially alerting the group members.

MMTelBindAci

connects the IMPU acquired from the subscriber registration to the existing ACI for the session transfer

MMTelStodEnabled

checks if the subscriber has the STOD service provisioned

MMTelStodTriggerAnchor

handles the transfer request and route it to the previous bound session

MMTelStodProcessHandover

intercepts the transfer INVITE routed by the MMTelStodTriggerAnchor feature and connects the existing called led to the new calling leg and releases the previous calling leg

MMTelECT

enables a party involved in a communication to transfer their role in that communication to a third party

Geo Local Normalization

adds the geo-local value to the Tel URI phone-context parameter for local numbers that should not be translated to international format.

DetermineSharedAndUndisclosedIdentities

uses information from a SIP INVITE and session state to determine if the call includes shared or undisclosed identity information associated with a companion device. The feature is run in both originating and terminating session execution plans.

Hide Undisclosed Identity

replaces the undisclosed identity with the shared identity for an originating call from a companion device where such hiding has been requested

DetermineRoamingFromHlr

is responsible for reading subscriber location data from the HLR and writing it into Sentinel session state variable fields.

MMTelDeterminePSAPCallback

determines whether a received SIP INVITE corresponds to a PSAP callback, and stops any other features that could potentially prevent the call being set up.

MMTel PSAP Callback

The two features here are responsible for identifying appropriate calls as PSAP callbacks and (if required) recording that a PSAP call has occurred.

Set Companion Device Headers

sets the companion device headers to the initial INVITE when the subscriber has been provisioned with companion devices.

Additionally, the MMTel AS provides support for a number of Vertical Service Code Features.

Feature What it does

LocationBasedDialling

updates the Request URI of a SIP INVITE, based on the location of the calling party and the dialled number

VoicemailDialling

redirects the calling party to their voicemail server.

XcapDataUpdate

performs a list of predefined HTTP PUT operations to update subscriber data in an XCAP server.

= Call Barring Features :indexpage:

Call Barring Features.

Feature What it does

MMTelICB

implements incoming communication barring and anonymous communication rejection

MMTelOCB

implements outgoing communication barring and operator determined retargeting

Operator Determined Barring

provides call barring rules determined by the operator that take precedence over MMTelICB and MMTelOCB

Operator Specific Barring Types

are 4 operator defined rules that are stored in the AS. The ODB data indicates which of them should be evaluated and, like all others ODB conditions, they take precedence over MMTelICB and MMTelOCB

Prefix Based Barring

provides a mechanism for an operator to augment the implicit or explicit condition of a MMTelOCB barring rule, so that the rule will also apply when the called party number matches some prefix with optional length criteria

General Feature Barring

provides a mechanism for preceding features to bar a call on behalf of the terminating user. It takes precedence over ODB and MMTelICB

= General Feature Barring :toc: macro :toclevels: 4 :toc-title: On this page…​

General Feature Barring provides a mechanism for preceding features to bar a call on behalf of the terminating user. It takes precedence over ODB and MMTelICB .

== What is General Feature Barring

General Feature Barring is an enhancement to Incoming Call Barring, to enable other features to trigger barring.

General Feature barring uses the BarIncomingCall session state field to signal that another feature wishes a call to be barred.

When BarIncomingCall is True then the call will be barred.

General Feature Barring takes precedence over ODB and ICB rules.

= MMTelICB :toc: macro :toclevels: 4 :toc-title: On this page…​

The MMTelICB feature implements incoming communication barring and anonymous communication rejection . (The MMTelOCB feature implements outgoing communication barring.)

== What is ICB?

3GPP defines Communication Barring in TS 24.611, including Incoming Communication Barring (ICB), Anonymous Communication Rejection as a special case of ICB, and Outgoing Communication Barring (OCB):

The incoming communication barring (ICB) is a service that rejects incoming communications that fulfil certain provisioned or configured conditions on behalf of the terminating user.

The anonymous communication rejection (ACR) is a particular case of the ICB service, that allows barring of incoming communications from an anonymous originator on behalf of the terminating user.

The incoming communication barring (ICB) service makes it possible for a user to have barring of certain categories of incoming communications according to a provisioned or user configured barring program and is valid for all incoming communications. A barring program is expressed as a set of rules in which the rules have a conditional part and an action part. Examples of conditions are whether the asserted originating public user identity matches a specific public user identity or whether the originating public user identity is restricted (anonymous). The action part could specify for a rule that contains a matching condition that the specific incoming communication is barred.

The inhibition of incoming forwarded calls is a special case of the ICB and allows the served user to reject incoming communications from users or subscribers who have diverted the communication towards the served user. The communication history information will be used to trigger the service.

The anonymous communication rejection (ACR) service allows the served user to reject incoming communications on which the asserted public user identity of the originating user is restricted. In case the asserted public user identity of the originating user is not provided then the communication is allowed by the ACR service. It is highlighted here because it is a regulatory service in many countries.

== Feature Cheat Sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

MMTEL

Yes

Terminating

SipAccess_SubscriberPreCreditCheck

Yes

Yes, comes from the HSS

Stateless

POJO

== Prerequisite Features

Note For announcements, SIPPlayAnnouncement is a dependent feature; but it is not a prerequisite.

== Interaction with OIP

According to section 4.6.4 of 3GPP TS 24.611, MMTelICB must run before MMTelOIP.

== Network Operator Data

This data is stored in a JSLEE Configuration Profile Table, called MMTelICBConfigProfileTable.

Operator data is scoped according to a Sentinel selection key.

Attribute Name

Type

 
Default Value

Description

 
PlayAnnouncement

Boolean

 
false

If true, ICB will request an announcement is played in the case that it bars the session setup.

 
ACRAnnouncementID

int

 
0

The ID for the announcement to be played in the case of Anonymous Call Rejection. If set to zero there is no announcement.

 
AnnouncementID

int

 
0

The ID for the announcement to be played in all other ICB cases. If set to zero there is no announcement.

 
InternationalRulesActive

Boolean

 
false

If false, ICB will ignore International and International-exHC rules.

== Session Input Variables

Variable name

Type

Comments

 
bxref:mmtel-subscriber-data-representation#mmtelicbservicedata[MMTelICBServiceData]

Complex

Read from the HSS or HLR in SubscriberDataLookupFromHSS or SubscriberDataLookupFromHLR

 
RoamingIndicator

Boolean

Set by the Determine International and Roaming Status feature.

 
International

Boolean

Set by the Determine International and Roaming Status feature.

 
InternationalExHC

Boolean

Set by the Determine International and Roaming Status feature.

 
BarIncomingCall

Boolean

Set by other preceding features to trigger General Feature Barring.

== Session Output Variables

Variable name Type Comments 
ICBBarred

Boolean

Set to true if the ICB feature bars the call. It exists so that feature execution scripts can read the variable and take action

 
ICBBarredWithAnnouncement

Boolean

Set to true if the ICB feature bars the call, and the feature is configured to request an announcement as part of barring

 
AnnouncementID

int

The announcement ID to be used if an announcement is configured as part of barring

 
EndSessionAfterAnnouncement

int

The status code used when ending the session — if barring has occurred and announcements are used.

 
RanIcb

Boolean

Signals to other features that ICB ran on this session.

== Supported Barring Rule Conditions

Barring rule conditions that are evaluated include:

=== Anonymous

To comply with the requirements as set for simulation of the ACR service, the anonymous element only evaluates to true when the conditions as set out in subclause 4.5.2.6.2 for asserted originating public user identity apply.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for anonymous calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="anonymous">
        <cp:conditions>
            <anonymous/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Roaming

This condition evaluates to true if the session state variable RoamingIndicator is true. This is set by the Determine International and Roaming Status feature.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for roaming calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="roaming">
        <cp:conditions>
            <roaming/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Media

This condition evaluates to true when the value of this condition matches the media field in one of the "m=" lines in the SDP message body offered in an INVITE request.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for calls offering specific media:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="no_video">
        <cp:conditions>
            <media>video</media>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

Combinations of media types may be expressed as multiple conditions within the same rule. For example:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="no_video_and_text">
        <cp:conditions>
            <media>video</media>
            <media>text</media>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Identity

This condition evaluates to true if the identity of the other party in the communication matches that which is expressed in the condition. The identity of the other party is taken from the P-Asserted-Identity and From headers from the incoming SIP message, and the condition will evaluate to true if either of those values matches it.

Identities within the condition can be expressed in different ways:

  • a single, fully expressed identity (e.g. sip:alice@example.com)

  • a whole domain (e.g. example.com)

  • a whole domain, but with exceptional identities or domains (e.g. example.com except for alice@example.com)

  • all identities (may also have exceptions)

  • any combination of the above

In case of a single identity (i.e. a 'one' condition), or in case of an exception (i.e. an 'except' condition), the URI in the condition and the URI to match against are both normalized before they are compared. Normalization is done using the Normalization Component.

The following XML snippets show how to configure the user’s Subscriber data for each of the above cases.

A single, fully expressed identity (the identity 'sip:alice@example.com' is matched)

This example, without any other rule, blocks any session from 'sip:alice@example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="bar-alice">
        <cp:conditions>
            <cp:identity>
                <one id="sip:alice@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A domain (all identities at 'example.com' are matched)

This example, without any other rule, blocks any session from domain 'example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="bar-domain">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com"></many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A whole domain with an exceptional identity (all identities at 'example.com' are matched except 'sip:alice@example.com')

This example, without any other rule, blocks any session from domain 'example.com' except if originated from 'sip:alice@example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-domain-with-exception">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com">
                    <except id="sip:alice@example.com"/>
                </many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A whole domain with an exceptional domain (all identities at 'example.com' are matched except 'sip:alice@example.com')

This example, without any other rule, blocks any session from domain 'example.com' except if originated from the subdomain 'callcentre.example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-domain-except-callcentre">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com">
                    <except domain="callcentre.example.com"/>
                </many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
Important Note the attribute of the 'except' element is now 'domain'.
All identites (all identities are matched)

This example, without any other rule, blocks all sessions from any user.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-all">
        <cp:conditions>
            <cp:identity>
                <many />
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A more complex Identity condition expression (all identies at 'example2.com' match except for 'sip:charlie@example2.com'. Also the identities 'sip:alice@example1.com' and 'sip:bob@example1.com' match.)

This example, without any other rule, blocks any session from all users registered in the domain 'example2.com', from the user 'sip:alice@example1.com' and from the user sip:bob@example1.com, except from 'sip:charlie@example2.com.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-some">
        <cp:conditions>
            <cp:identity>
                <one id="sip:alice@example1.com"/>
                <one id="sip:bob@example1.com"/>
                <many domain="example2.com">
                    <except id="sip:charlie@example2.com"/>
                </many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
Another more complex Identity condition expression with more than one rule.

This example, always blocks some domains, always allow other domains and a set of sip URIs.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="always-allow-these-domains">
        <cp:conditions>
            <cp:identity>
                <many domain="emergency.org"></many>
                <many domain="police.org"></many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>true</allow>
        </cp:actions>
    </cp:rule>

    <cp:rule id="always-barr-these-domains">
        <cp:conditions>
            <cp:identity>
                <many domain="fakelotery.org"></many>
                <many domain="dhueb!.org"></many>
        <many domain="fakeprize.com"></many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>

   <cp:rule id="always-barr-these-identities">
        <cp:conditions>
            <cp:identity>
                <one id="sip:john@example.com"/>
                <one id="sip:marc@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>

</cp:ruleset>
Tip Depending on the value of the 'allow' element of the rule, the rule can essentially become an 'allowlist' or a 'blocklist'.

=== International

This condition evaluates to true if the session state variable International is true and 'InternationalRulesActive' is true. 'International' is set by the Determine International and Roaming Status feature. 'InternationalRulesActive' is configured in the ICB feature profile and defaults to false. This is because it is not possible to accurately determine whether the calling party is international in all circumstances.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for international calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="international">
        <cp:conditions>
            <international/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== International-exHC

This condition evaluates to true if the session state variable InternationalExHC is true and 'InternationalRulesActive' is true. 'International' is set by the Determine International and Roaming Status feature. 'InternationalRulesActive' is configured in the ICB feature profile and defaults to false. This is because it is not possible to accurately determine whether the calling party is international in all circumstances.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for international-exHC calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="international-exHC">
        <cp:conditions>
            <international-exHC/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Unconditional

An empty conditions element is used to represent unconditional.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for all calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="anonymous">
        <cp:conditions/>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Communication Diverted

This condition evaluates to true when the incoming communication has been previously diverted.

Diverted communication can be recognised by the presence of the History header field, as specified in 3GPP TS 24.604

Use this XML in the REM HSS Subscriber Data Page to configure ICB for diverted calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="diverted">
        <cp:conditions>
            <communication-diverted/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Validity

This condition evaluates to true if the current time is within the times specified by the validity period Time is based on the Home Network time; that is, the time of the MMTel Server.

Use this XML in the REM HSS Subscriber Data Page to configure ICB for a validity period:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="validity">
        <cp:conditions>
            <cp:validity>
                <cp:from>2000-01-01T00:00:00</cp:from>
                <cp:until>2099-12-31T23:59:59</cp:until>
            </cp:validity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Rule Deactivated

This condition always evaluates to false. Generally used to disable a rule that has other conditions without removing the rule entirely.

The rule is re-enabled by removing this condition.

Use this XML in the REM HSS Subscriber Data Page to configure a deactivated rule:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="deactivated">
        <cp:conditions>
            <rule-deactivated/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Barring Rule Actions

Barring rule actions are a string. There could be many actions defined, but the only one that makes any sense is the allow action.

The allow action has a Boolean attribute, with meaning as follows:

  • true — allow session setup to proceed

  • false — deny session setup from proceeding.

Any other rule action (in other words, an action that is not set to allow) will result in us treating the action as the following:

  • allow rule action with value of true.

== Statistics

MMTelICB statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → MMTelICB
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.MMTelICB"

Statistic Type Incremented when…​ 
Started

Counter

the feature runs

 
FailedToStart

Counter

Sentinel VoLTE encounters an error while attempting to start the feature

 
IssuedWarning

Counter

a non-fatal problem is encountered and the feature issues a warning

 
FailedDuringExecution

Counter

a fatal problem is encountered and the feature cannot execute correctly

 
TimedOut

Counter

the feature takes too long to complete and Sentinel VoLTE aborts execution

 
CallBarred

Counter

the feature bars a call (including when barring due to ACR)

 
CallBarredByOdb

Counter

the feature bars a call by Operator Determined Barring rule

 
PlayAnnouncementTriggered

Counter

the feature requests that an announcement be played to the calling party

 
ACRTriggered

Counter

a call is barred by ACR

 
OdbRulesEvaluatedTrue

Counter

a rule was evaluated to be True

 
RulesEvaluatedTrue

Counter

incremented by the number of rules which evaluated true

 
FallbackToNetworkDefaultServiceConfig

Counter

incremented when the feature uses the network default service configuration as the session state does not contain the feature specific subscriber service data.

== Behaviour

=== Determination

If operator data is not present, the ICB feature:

  1. Increments an error statistic.

  2. Logs a message at the Fine level.

  3. Informs the Sentinel core that the feature is not configured appropriately (Invalid Configuration).

  4. Exits.

If General Feature Barring determines that a call should be barred - [Barring Action] below proceeds.

If MMTelICBServiceData.OperatorAuthorized or MMTelICBServiceData.Active is false, the feature finishes execution without modifying any state.

If the rules do not parse, then the feature:

  • instructs Sentinel core that the feature has failed due to configuration problems

  • finishes execution without modifying any state.

Incoming ODB [Rule Processing] occurs as below.

If no ODB rules match, ICB [Rule Processing] occurs as below.

If either rule set determines allow=false, the [Barring Action] is performed as below.

If either set determines allow=true or no rules are matched, the ICB feature sets the session output variable ICBBarred to false and finishes without modifying any further state.

=== Rule Processing When the feature processes a set of rules (either ODB or ICB):

For each rule, if then

  • the rule has no <conditions> element;

  • the rule has an empty <conditions> element; or

  • conditions are present and they all evaluate to true;

the rule matches.

The actions from all matching rules are combined.

If…​ then the combined result for the rule set is:

any matching rules had the action allow=true

allow=true

all matching rules had the action allow=false

allow=false
Tip When a rule contains multiple conditions, they all must match for the whole rule to match. This is essentially a logical 'AND' between the conditions. To express a logical 'OR' of conditions, the conditions must be placed in different rules.

=== Barring Action

If a ruleset determines allow=false or GFB bars the call then…​

The ICB feature sets the session output variable ICBBarred to true.

If network configuration has PlayAnnouncement set to true (MmtelICBConfig.PlayAnnouncement == true), and ICB has decided to bar the communication, then the ICB feature sets session output variable AnnouncementID to MmtelICBConfig.AnnouncementID.

Finally, if the communication is to be barred, ICB rejects the call with the appropriate SIP error response code:

If any matching rule contains the “anonymous” condition, use 433 Anonymity Disallowed. This is to provide ACR functionality. (See section 4.5.2.6.1.)

Otherwise use 603 Decline.

=== Roaming Determination

The ICB feature does not compute whether or not the served user is roaming; rather it relies on a session input variable (isRoaming). This is set by Sentinel’s DetermineIfRoaming feature.

Example feature execution script fragment:

run DetermineInternationalAndRoamingStatus
run MMTelICB

=== Playing Announcements

The MMTelICB feature does not play announcements itself; rather it relies on setting of session output variables (AnnouncementID, ICBBarredWithAnnouncement, EndSessionAfterAnnouncement). These are set by the MMTelICB feature if an announcement is to be played. They are used by the out-of-the-box feature execution scripts such that if announcements are desired to be played prior to the barred call being terminated, it is played using the SIPPlayAnnouncement feature.

This is an example feature execution script, taken from a fragment of the out-of-the-box execution scripts.

run MMTelICB
if (session.ICBBarredWithAnnouncement) {
   run SIPPlayAnnouncement
}

The SIPPlayAnnouncement feature checks session state for the AnnouncementID field, and if the value is non-zero will play an announcement. When the announcement is played using the SIPPlayAnnouncement feature, it is played to the calling party.

Finally, when the announcement is complete the SIPPlayAnnouncement feature ends the session with the appropriate SIP error response (provided by MMTelICB during its execution). The SIP error response code is set in the EndSessionAfterAnnouncement session output variable.

=== Graceful Handling of Originating Access

ICB is a terminating feature. It will finish execution without modifying any state if it is invoked in an originating attempt.

== Background Information on Format of Barring Rules

Each rule is expressed as an XCAP cp-rule.

That is, it is an XML fragment:

<cp:rule id="rule66">
        <cp:conditions>
        condition1
        condition2
        </cp:conditions>
        <cp:actions>
          <allow>false</allow>
        </cp:actions>
 </cp:rule>

In case that the allow element is not found, the feature assumes allow = false.

= MMTelOCB :toc: macro :toclevels: 4 :toc-title: On this page…​

The MMTelOCB feature implements outgoing communication barring and operator determined retargeting .

(The MMTelICB feature implements incoming communication barring and anonymous communication rejection.)

== What is OCB?

3GPP defines communication barring in TS 24.611, including Incoming Communication Barring (ICB), Anonymous Communication Rejection as a special case of ICB, and Outgoing Communication Barring (OCB):

The Outgoing Communication Barring (OCB) is a service that rejects outgoing communications that fulfil certain provisioned or configured conditions on behalf of the originating user.

The Outgoing Communication Barring (OCB) service makes it possible for a user to have barring of certain categories of outgoing communications according to a provisioned or user configured barring program and is valid for all outgoing communications. A barring program is expressed as a set of rules in which the rules have a conditional part and an action part. An example condition is whether the request uri matches a specific public user identity. The action part can specify for a rule that contains a matching condition that the specific outgoing communication is to be barred. The complete set of conditions and actions that apply to this service and their semantics is described in subclause 4.9.Incoming.

== Feature cheat sheet

Feature Script Name

MMTelOCB

MMTel or SCC

MMTel

Call-Type

Originating

Session Plan

mmtel-orig

Execution Points

SipAccess_SubscriberCheck, SubscriptionSipRequest

Network Operator Config

Yes

Subscriber Config

Yes

POJO or SBB

POJO

Feature FSMs

None

Feature Parameters

None

SAS Support

Yes

== Prerequisite features

Note For announcements, SIPPlayAnnouncement is a dependent feature; but it is not a prerequisite.

== Network Operator Data

The MMTelOCB feature retrieves configuration from three profile tables and an address list:

  • The MMTelOCBConfigProfileTable provides the basic configuration for the feature.

  • The MMTelOdbOperatorSpecificTypeRuleProfileTable provides operator-specific ODB rule configuration.

  • The ${platform.operator.name}_PrefixBarring_AddressListEntryTable maps dialled numbers to prefix barring classifications.

  • The PrefixBarringClassificationsTable defines matching criteria and the barring treatment for classes of dialled prefixes.

=== MMTelOCBConfigProfileTable

Basic feature configuration is stored on a profile table called MMTelOCBConfigProfileTable.

Operator data is scoped according to a Sentinel selection key.

Attribute Name Type Default Description 
PlayAnnouncement

boolean

false

If true, MMTelOCB will request an announcement is played when it bars a call.

 
AnnouncementID

int

0

The ID for the announcement to be played. If set to 0 no announcement will be played.

=== MMTelOdbOperatorSpecificTypeRuleProfileTable

Operator specific ODB rule configuration is stored on a profile table called MMTelOdbOperatorSpecificTypeRuleProfileTable.

See How to Provision the Operator Specific Barring Rules for details of this profile table.

=== ${platform.operator.name}_PrefixBarring_AddressListEntryTable

An address list called ${platform.operator.name}_PrefixBarring_AddressListEntryTable is used to classify the called number for prefix based barring.

See How to Configure Prefix Based Barring.

=== PrefixBarringClassificationsTable

The prefix barring address list references one or more classifications for calls to addresses that match the prefix.

Details of how each classification is treated are stored in PrefixBarringClassificationsTable profile table.

See How to Configure Prefix Based Barring.

== Session Input Variables

Variable name Type Comments

MMTelOCBServiceData

Complex

Read from the HSS or HLR in SubscriberDataLookupFromHSS or SubscriberDataLookupFromHLR

OdbServiceData

Complex

Read from the HSS in SubscriberDataLookupFromHSS

RoamingIndicator

Boolean

Set by the Determine International and Roaming Status feature

International

Boolean

Set by the Determine International and Roaming Status feature

InternationalExHC

Boolean

Set by the Determine International and Roaming Status feature

== Session Output Variables

Variable name Type Comments 
OCBBarred

boolean

Set to true if the OCB feature bars the call.

 
EarlyMediaAnnouncementInfoQueue

List<SipAnnouncementInformation>

Feature adds an entry with the value of the announcement ID to be played.

 
EndSessionAfterAnnouncement

int

The status code used when ending the session if barring has occurred and announcements are used.

 
RanOcb

boolean

Signal to other features that OCB ran on this session.

 
MonitorCallOnly

boolean

Set to true if the feature determines that charging should be disabled for the call.

== Statistics

MMTelOCB statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → MMTelOCB
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.MMTelOCB"

Statistic Type Description 
Started

Counter

Incremented when the feature is invoked.

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning.

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly.

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
CallBarred

Counter

Incremented when the feature bars a call.

 
CallExplicitlyAllowed

Counter

Incremented when the feature finds a rule that explicitly allows the call to go through, thus preventing any barring.

 
ODBRuleApplied

Counter

Incremented when an ODB rule’s conditions were met and its action was executed.

 
OCBRuleApplied

Counter

Incremented when an OCB rule’s conditions were met and its action was executed.

 
PrefixBasedRuleApplied

Counter

Incremented when a rule was applied due to prefix barring. Either CallBarred, CallExplicitlyAllowed or RedirectionRequested will be incremented in tandem. ODBRuleApplied will not be incremented, even when the treatment is an OSBType rule.

 
PlayAnnouncementTriggered

Counter

Incremented when the feature requests that an announcement be played to the calling party.

 
RedirectionRequested

Counter

Incremented when an operator specific ODB rule’s conditions were met and it has been configured to redirect the call.

 
RedirectionFailed

Counter

Incremented when an attempt to redirect the outbound INVITE fails.

 
RedirectionSuccessful

Counter

Incremented when an attempt to redirect the outbound INVITE is successful.

 
OdbSpecificTypeRulesNotFound

Counter

Incremented when the subscriber data for the served user indicates that an operator specific ODB rule should be applied, but no configuration could be found for the specified rule.

 
ClassifiedNumberByPrefix

Counter

Incremented when prefix barring classifies the dialled number as triggering some barring treatment(s).

 
FoundMultipleNonConflictingPrefixBarringClassifications

Counter

Incremented when prefix barring classifies the dialled number and selects multiple classifications, all with separate treatments.

 
FoundConflictingPrefixBarringClassifications

Counter

Incremented when prefix barring classifies the dialled number and selects multiple classifications, with some duplicate treatments. Such as

  • classification1

    • BarringTreatment=OperatorBar

    • OverrideOCBAnnouncement=true

    • announcementID=1

  • classification2

    • BarringTreatment=OperatorBar

    • OverrideOCBAnnouncement=true

    • announcementID=0

 
FallbackToNetworkDefaultServiceConfig

Counter

Incremented when the feature uses the network default service configuration as the session state does not contain the feature specific subscriber service data.

== Supported Barring Rule Conditions

=== Roaming

This condition evaluates to true if the session state variable RoamingIndicator is true. This is set by the Determine International and Roaming Status feature.

Use this XML in the REM HSS Subscriber Data page to configure OCB for roaming calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="roaming">
        <cp:conditions>
            <roaming/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Media

This condition evaluates to true when the value of this condition matches the media field in one of the "m=" lines in the SDP message body offered in an INVITE request.

Use this XML in the REM HSS Subscriber Data Page to configure OCB for calls offering specific media:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="no_video">
        <cp:conditions>
            <media>video</media>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

Combinations of media types may be expressed as multiple conditions within the same rule. For example:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="no_video_and_text">
        <cp:conditions>
            <media>video</media>
            <media>text</media>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Identity

This condition evaluates to true if the identity of the other party in the communication matches that which is expressed in the condition. The identity of the other party is taken from the Request-URI and To (or Refer-To, for REFER messages) headers from the incoming SIP message, and the condition will evaluate to true if either of those values matches it.

Identities within the condition can be expressed in different ways:

  • a single, fully expressed identity (e.g. sip:alice@example.com)

  • a whole domain (e.g. example.com)

  • a whole domain, but with exceptional identities or domains (e.g. example.com except for alice@example.com)

  • all identities (may also have exceptions)

  • any combination of the above

In case of a single identity (i.e. a 'one' condition), or in case of an exception (i.e. an 'except' condition), the URI in the condition and the URI to match against are both normalized before they are compared. Normalization is done using the Normalization Component.

The URI to match against although normalized comes from the inbound request. This means that the URI will not have had number translation features such as SIP Short Code applied. Therefore any condition intended to match a shortcode should take this into account.

The following XML snippets show how to configure the user’s Subscriber data for each of the above cases.

A single, fully expressed identity (the identity 'sip:alice@example.com' is matched)

This example, without any other rule, blocks any session towards 'sip:alice@example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-alice">
        <cp:conditions>
            <cp:identity>
                <one id="sip:alice@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A domain (all identities at 'example.com' are matched)

This example, without any other rule, blocks any session towards any user in the 'example.com' domain.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-domains">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com"></many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A whole domain with an exceptional identity (all identities at 'example.com' are matched except 'sip:alice@example.com')

This example, without any other rule, blocks any session towards any user in the 'example.com' domain, except for 'sip:alice@example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-domains-with-exceptions">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com">
                    <except id="sip:alice@example.com"/>
                </many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A whole domain with an exceptional domain (all identities at 'example.com' are matched except 'sip:alice@example.com')

This example, without any other rule, blocks any session towards any user in the 'example.com' domain, except for users within the domain 'callcentre.example.com'.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-domain-except-callcentre">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com">
                    <except domain="callcentre.example.com"/>
                </many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
Important Note the attribute of the 'except' element is now 'domain'.
All identities (all identities are matched)

This example, without any other rule, blocks all sessions towards any user.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-all">
        <cp:conditions>
            <cp:identity>
                <many />
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
A more complex Identity condition expression (all identities at 'example2.com' match except for 'sip:charlie@example2.com'. Also the identities 'sip:alice@example1.com' and 'sip:bob@example1.com' match.)

This example, without any other rule, blocks any session towards any user registered in the domain 'example2.com' except for 'sip:charlie@example2.com, for 'sip:alice@example1.com' and sip:bob@example1.com.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="barr-some">
        <cp:conditions>
            <cp:identity>
                <one id="sip:alice@example1.com"/>
                <one id="sip:bob@example1.com"/>
                <many domain="example2.com">
                    <except id="sip:charlie@example2.com"/>
                </many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>
Another more complex Identity condition expression with more than one rule.

This example, always blocks some domains, always allow other domains and a set of sip URIs.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="always-allow-these-domains">
        <cp:conditions>
            <cp:identity>
                <many domain="emergency.org"></many>
                <many domain="police.org"></many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>true</allow>
        </cp:actions>
    </cp:rule>

    <cp:rule id="always-barr-these-domains">
        <cp:conditions>
            <cp:identity>
                <many domain="fakelotery.org"></many>
                <many domain="dhueb!.org"></many>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>

   <cp:rule id="always-barr-these-identities">
        <cp:conditions>
            <cp:identity>
                <one id="sip:john@example.com"/>
                <one id="sip:marc@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>

</cp:ruleset>
Tip Depending on the value of the 'allow' element of the rule, the rule can essentially become an 'allowlist' or a 'blocklist'.

=== International

This condition evaluates to true if the session state variable International is true. This is set by the Determine International and Roaming Status feature.

Use this XML in the REM HSS Subscriber Data page to configure OCB for international calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="international">
        <cp:conditions>
            <international/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== International-exHC

This condition evaluates to true if the session state variable InternationalExHC is true. This is set by the Determine International and Roaming Status feature.

Use this XML in the REM HSS Subscriber Data page to configure OCB for international-exHC calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="international-exHC">
        <cp:conditions>
            <international-exHC/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== International when roaming

This condition evaluates to true if the session state variable International is true and RoamingIndicator is true. These are set by the Determine International and Roaming Status feature.

Use this XML in the REM HSS Subscriber Data page to configure OCB for international when roaming calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="international">
        <cp:conditions>
            <roaming/>
            <international/>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Unconditional

Use this XML in the REM HSS Subscriber Data page to configure OCB for all calls:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="all-calls">
        <cp:conditions/>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Validity

This condition evaluates to true if the current time is within the times specified by the validity period.

Time is based on the Home Network time (that is, the time of the MMTel Server).

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="all-calls">
        <cp:conditions>
            <cp:validity>
                <cp:from>1970-01-01T00:00:00</cp:from>
                <cp:until>1970-01-01T00:00:00</cp:until>
            </cp:validity>
        </cp:conditions>
    </cp:rule>
</cp:ruleset>

=== Rule deactivated

This condition always evaluates to false. Used to disable a rule without removing the rule entirely. The rule is re-enabled by removing this condition.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy" xmlns:ocp="urn:oma:xml:xdm:common-policy">
    <cp:rule id="all-calls">
        <cp:conditions>
            <rule-deactivated/>
            <cp:validity>
                <cp:from>1970-01-01T00:00:00</cp:from>
                <cp:until>1970-01-01T00:00:00</cp:until>
            </cp:validity>
        </cp:conditions>
    </cp:rule>
</cp:ruleset>

==== Barring rule actions

Barring rule actions are a string. There could be many actions defined, but the only one that makes any sense is the allow action.

The allow action has a Boolean attribute, with meaning as follows:

  • true — allow session setup to proceed

  • false — deny session setup from proceeding.

Any other rule action (that is, an action that is not set to allow) will result in us treating the action as the following:

  • allow rule action with value of true.

== Behaviour

=== Initial Checks

When triggered the feature first undergoes a series of checks to ensure that the conditions for the feature to run are met. The feature enforces the following conditions:

  • The call-type is Originating or Forwarded.

  • OCB service data for the subscriber has been successfully loaded and the OperatorAuthorized flag in the data is set to true.

  • Network operator configuration for the feature is present and has been successfully loaded.

  • The invoking trigger for the feature is an inbound SIP INVITE or REFER request.

If any of those conditions are not met, the feature will terminate immediately and the OCB service will not run.

=== Barring Rule Evaluation

If all checks passed, then the feature will move on to carry out barring rule evaluation. This occurs in three phases, one for each type of rule:

  1. All operator specific type rules are evaluated. If any of them apply (be they a barring, retarget or explicit allow action), then the feature will execute the appropriate action and then skip the following phases. Prefix barring interacts with this step as described in Prefix Based Barring Behaviour

  2. The remaining ODB rules are evaluated, again if any of the rules apply, their action will be executed and the final evaluation phase skipped.

  3. Prefix based premium-rate communication barring options are evaluated as described in Prefix Based Barring Behaviour

  4. Standard OCB rules will be evaluated and the appropriate action applied if one is matched. This final phase will be skipped if the MMTel OCB Active flag is set to false in the service data.

When deciding whether a rule should be applied, the feature will check the set of conditions provided by the rule. The feature will apply the rule if any of the following statements are true:

  • The rule has no set of conditions, i.e. the <conditions> element is absent in the rule definition.

  • The set of conditions for the rule is empty.

  • All of the conditions within the set defined in the rule are met.

If none of those statements are true for any rule, the feature will complete execution and the call will be allowed to continue.

==== Rule Format

Each rule is expressed as an XCAP cp:rule XML fragment, for example:

<cp:rule id="rule66">
    <cp:conditions>
        <roaming/>
        <media>video</media>
    </cp:conditions>
    <cp:actions>
        <allow>false</allow>
    </cp:actions>
 </cp:rule>

When the allow element is not found, the feature assumes allow is false.

=== Rule Actions

When a rule is applied, there are three possible actions the feature may have to carry out:

  1. Allowlisting (that is, call is explicitly allowed to continue)

  2. Call barring

  3. Retargeting (only available with operator specified ODB rules)

==== Allowlisting

If the action of an applicable rule indicates the call should be allowed, then the feature immediately stops evaluating other rules and allows the call to proceed.

==== Call Barring

If the action of an applicable rule indicates that the call should be barred, the feature won’t act immediately. It will first evaluate the other rules of the same type to ensure that none of them indicate that the call should be allowlisted. If the call is not allowlisted by another rule, then the feature will execute the call barring procedure as follows:

  1. Set the OCBBarred session state flag to true to limit which features will run after MMTelOCB.

  2. Increment appropriate stats to indicate the call was barred.

  3. Check whether the method for the incoming message is INVITE or REFER, and execute the appropriate procedure as described below.

INVITE barring procedure:

  1. Check the feature configuration to determine if an announcement needs to played.

  2. Depending on the outcome:

    1. If an announcement does not need to be played, instruct sentinel to immediately terminate the call with a 603 Decline response for the INVITE request.

    2. If an announcement is to be played:

      1. Suppress online charging for the call (if applicable).

      2. Queue an announcement for the SipPlayAnnouncement feature, using the announcement ID provided in the feature configuration.

      3. Set the EndSessionAfterAnnouncement session state field to indicate to the SipPlayAnnouncement that it should terminate the session with a 603 Decline response for the original INVITE request after the announcement has been played.

REFER barring procedure:

  1. Send a SIP 403 Forbidden response for the REFER request.

  2. Search for the outbound REFER on the outbound leg’s message queue, and then remove it.

==== Retargeting

Only operator-specific ODB rules can be used to retarget a call. In the rule XML, the action is still listed with allow being false (i.e. bar the call), but additional configuration on the MMTelOdbOperatorSpecificTypeRuleProfileTable is used to transform the rule action into a retarget. If there are multiple applicable operator-specific ODB rules for a call, and they retarget to different destinations, or one retargets and another bars the call, then the rule with the lowest Type number will take precedence (e.g. the Type2 rule will take precedence over the Type3 rule). However, as always, an operator-specific ODB rule that explicitly allowlists the call will take precedence regardless of its number.

When it is determined that a call should be retargeted, the procedure is as follows:

  1. Retrieve the new target URI from the rule’s configuration profile on the MMTelOdbOperatorSpecificTypeRuleProfileTable.

  2. Release the original outbound leg towards the called party (at this point no signalling should have occurred on this leg, so no message is sent to do this).

  3. Generate a new outbound INVITE request from the original inbound request.

  4. Update the newly created request to retarget it, the procedure for doing this is similar to the one used by unconditional forwarding (CFU) in the MMTelCDIV feature:

    1. The Request-URI is set to the value of the new target URI and a cause=302 parameter is added.

    2. The To header is set to the value of the new target URI.

    3. The History-Info header is modified/added to indicate a diversion has occurred, the original target URI is given the 'privacy=history' parameter.

  5. Create a new outbound leg (named MMTelOCBRetargetedLeg) to send the new INVITE request, and link this leg to the calling party leg.

  6. If the rule’s configuration profile indicates that the redirected call should not be subject to online charging, then suppress online charging for the call.

  7. If the rule’s configuration profile indicates that a retarget announcement should be played, then queue an announcement with the announcement ID provided in the rule’s configuration (note that the standard barring announcement as configured on the MMTelOCBConfigProfileTable will not be played on a retarget action).

If at any point in the procedure there is a problem that prevents retargeting from working, then the feature will fall back to standard call barring behaviour (including playing the standard barring announcement if applicable).

==== Rule Priority

The behavior described above gives rise to a natural priority that rules will follow when multiple rules with different actions are applicable to a call.

To summarise:

  • There are different types of rules: Prefix based OperatorAllow , Prefix based OperatorBar, Operator-specific ODB rules, Prefix based premium-rate communication barring, standard ODB rules, and OCB rules.

  • The overall priority is

    • Prefix based OperatorAllow

    • Operator-specific ODB rules that allowlist a call, regardless whether applied by matching their defined condition, or by prefix based treatment

    • Prefix based OperatorBar

    • Operator-specific ODB rules that bar a call, regardless whether applied by matching their defined condition, or by prefix based treatment

    • Prefix based premium-rate communication barring

    • Standard ODB rules

    • OCB rules

  • Within rules of the same type, an allowlisting action will always take precedence over a barring or retargeting action.

  • If multiple operator-specific ODB rules apply and have conflicting retarget or barring actions, then the rule with the lower number will take precedence. (there are four slots available for operator-specific ODB rules, numbered one through four).

=== Roaming and International Determination

The MMTelOCB feature does not compute whether or not the served user is roaming or international; rather it relies on a session input fields (RoamingIndicator, International, and InternationalExHC). These fields are set by the DetermineInternationalAndRoamingStatus feature. For this reason the DetermineInternationalAndRoamingStatus feature must run before MMTelOCB in the feature execution scripts if international and roaming status need to be considered.

=== Playing Announcements

The MMTelOCB feature does not play announcements itself; rather it relies on setting data in session output fields (EarlyMediaAnnouncementInfoQueue and EndSessionAfterAnnouncement) if an announcement is to be played. These fields are read by the SipPlayAnnouncement feature.

Based on the the data in the fields that feature will:

  • Handle the signalling required to play the announcement to the calling party.

  • Terminate the call after the announcement if instructed to do so.

For this reason the SipPlayAnnouncement feature must run after MMTelOCB in the feature execution scripts if announcements are required.

= Operator Determined Barring :toc: macro :toclevels: 4 :toc-title: On this page…​

Operator Determined Barring provides call barring rules determined by the operator that take precedence over MMTelICB and MMTelOCB .

== What is ODB?

Operator determined barring is specified for IMS in the 3GPP specifications TS 24.315 and TS 22.041:

from TS 24.315

The network feature Operator Determined Barring (ODB) allows a network operator or service provider to regulate access to IMS subsystem services, by the barring of certain categories of incoming or outgoing communications, the barring of certain categories of roaming and the barring of certain categories of supplementary services configuration and invocation.

The Sentinel VoLTE TAS provides an extension to standard ODB that allows the operator to retarget outbound calls to an arbitrary destination. See How to provision the Operator Specific Barring rules for details of how to enable this functionality, and MMTelOCB Behaviour for details of how it is executed.

== ODB Data

The ODB data is stored as transparent data in the HSS. The SubscriberDataLookupFromHSS feature is responsible to retrieve the ODB data from the HSS. The SubscriberDataLookupFromHSS Configuration should contain the service indication as IMS-ODB-Information and the proper codec. The SubscriberDataLookupFromHSS queries the HSS and if the operator had configured any ODB rules for that subscriber then user data will be returned, parsed and then stored in a session state field MMTelODBServiceData. The MMTelICB and MMTelOCB will use the session state field MMTelODBServiceData to evaluate the ODB conditions before the subscriber defined conditions.

== Enabling ODB

ODB can be enabled using the DisableQuery option in the SubscriberDataLookupFromHSS.

== Supported Barring Rule Conditions

The sections below show XML data stored in the HSS for the supported conditions. The outgoing conditions are evaluated by the MMTelOCB feature, the incoming conditions are evaluated by MMTelICB and the operator type conditions are evaluated by both features.

== Enabling ODB

The HSS IMS-ODB-Information query can be enabled using the DisableQuery option in the SubscriberDataLookupFromHSS.

=== Bar all outgoing communications

Bar all of the outgoing communications, The OutgoingBarring tag is set to "0".

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
            <OutgoingBarring>0</OutgoingBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar all outgoing international communications

Barring of all outgoing communications to international destinations. The OutgoingBarring tag is set to "1".

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
            <OutgoingBarring>1</OutgoingBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar all outgoing communications when international ex-hplmnc

Barring of all outgoing communications to international destinations excluding home network. The OutgoingBarring tag is set to "2".

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
           <OdbForImsMultimediaTelephonyServices>
            <OutgoingBarring>2</OutgoingBarring>
           </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar all outgoing communications when roaming

Barring of all outgoing communications roaming outside the home PLMN country. The OutgoingBarring tag is set to "3".

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
            <OutgoingBarring>3</OutgoingBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar all incoming communications

Barring of all incoming communications, the IncomingBarring tag is set to "0".

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
           <IncomingBarring>0</IncomingBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar all incoming communications when roaming

Barring of all incoming communications when roaming outside the home PLMN country. The IncomingBarring tag is set to "1".

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
           <IncomingBarring>1</IncomingBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar Outgoing Premium-Rate Communication

The premium-rate barring options can be described as follows:

Option Description

PremiumRateCommunicationsInformation

Bar all outgoing communications where the request URI has a "premium-rate" parameter with the value "information".

PremiumRateCommunicationsEntertainment

Bar all outgoing communications where the request URI has a "premium-rate" parameter with the value "entertainment".

PremiumRateCallsInformationWhenRoamingOutsideHplmnCountry

The same as 'PremiumRateCommunicationsInformation' but only for communications that are roaming outside of the Home PLMN Country.

PremiumRateCallsEntertainmentWhenRoamingOutsideHplmnCountry

The same as 'PremiumRateCommunicationsEntertainment' but only for communications that are roaming outside of the Home PLMN Country.

Certain prefix-based Barring Treatments will also affect the matching of these premium-rate barring options.

The information on ODB data in the HSS indicates which options should be evaluated.

Example XML:

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
           <OutgoingPremiumRateBarring>
               <PremiumRateCommunicationsInformation>
                    true
               </PremiumRateCommunicationsInformation>
               <PremiumRateCommunicationsEntertainment>
                    true
               </PremiumRateCommunicationsEntertainment>
               <PremiumRateCallsInformationWhenRoamingOutsideHplmnCountry>
                    true
               </PremiumRateCallsInformationWhenRoamingOutsideHplmnCountry>
               <PremiumRateCallsEntertainmentWhenRoamingOutsideHplmnCountry>
                    true
               </PremiumRateCallsEntertainmentWhenRoamingOutsideHplmnCountry>
           </OutgoingPremiumRateBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Operator Specific Barring Rules

The Operator Specific Barring Types conditions specifies 4 types of user defined rules. The rules are stored in the VoLTE profiles and follow the same schema for Simservs RuleSet. The information on ODB data in the HSS just indicates which rule types should be evaluated.

The example below indicated that all 4 rules should be evaluated.

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
           <OperatorSpecificBarring>
	      <Type1>true</Type1>
	      <Type2>true</Type2>
	      <Type3>true</Type3>
	      <Type4>true</Type4>
    	  </OperatorSpecificBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar Invocation of communication transfer

This condition prevents the Explicit Call Transfer feature MMTelECT from running. The conditions are:

Condition Description

SimpleInvocationOfCommunicationTransferBarring

Prevents user-invoked call transfers from happening. Has three options:

  • Barring of Invocation of Communication Transfer (0)

  • Barring of Invocation of Communication Transfer Where at least one leg is charged (1) Not Supported

  • Barring of Invocation of Communication Transfer Where at least one leg is charged at international rates (2) Not Supported

InvocationOfChargeableCommunicationTransferBarring

Prevents user-invoked call transfers when both calls are charged to the served user. Not Supported

MultipleInvocationOfCommunicationTransferBarring

Prevents a user-invoked call transfer when there is an existing transferred call for the served user.

 
<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
            <SimpleInvocationOfCommunicationTransferBarring>
               0
            </SimpleInvocationOfCommunicationTransferBarring>

    	    <InvocationOfChargeableCommunicationTransferBarring>
               true
            </InvocationOfChargeableCommunicationTransferBarring>

   	    <MultipleInvocationOfCommunicationTransferBarring>
               true
            </MultipleInvocationOfCommunicationTransferBarring>

          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar Management of Supplementary Services

This condition is evaluated during provisioning time when the subscriber tries to change its own supplementary services configuration via XCAP Interface. If the condition is set to true the XCAP servers will deny any change to subscriber change attempt.

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
            <BarringOfSupplementaryServicesManagement>
               true
            </BarringOfSupplementaryServicesManagement>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== Bar Registration of Diverted To Address

This condition is evaluated during provisioning time when the subscriber tries to change the target to address of the supplementary services via XCAP Interface. Currently the diverted to address is present at the Communication Diversion (CDIV) settings. It is the <target> sub-element of the <forward-to> element in a CDIV rule’s actions.

The bar condition can have the following values:

  • 0 Barring of Registration of any communication diverted-to address

    • currently supported

  • 1 Barring of Registration of any international communication diverted-to address

    • not supported yet

  • 2 Barring of Registration of any international communication diverted-to address EXHPLMNC

    • not supported yet

<?xml version="1.0" encoding="utf-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>IMS-ODB-Information</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
         <OdbForImsOrientedServices xmlns="odb.mmtel.sentinel.volte.opencloud.com">
          <OdbForImsMultimediaTelephonyServices>
            <DivertedToAddressRegistrationBarring>
               0
            </DivertedToAddressRegistrationBarring>
          </OdbForImsMultimediaTelephonyServices>
         </OdbForImsOrientedServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

= Operator Specific Barring Types :toc: macro :toclevels: 4 :toc-title: On this page…​

The Operator Specific Barring Types are 4 operator defined rules that are stored in the AS. The ODB data indicates which of them should be evaluated and, like all others ODB conditions, they take precedence over MMTelICB and MMTelOCB .

== What is Operator Specific Barring?

The 3GPP specifications TS 24.315 defines:

The Operator specific barring definition for type 1, type 2, type 3, and type 4 is locally configured in the AS providing the ODB service. For operator specific barring the criteria that can be used by the operator to define conditions that are used to determine whether the category applies may be based on any signalling information from the incoming request. Examples of such criteria are: 1) destination type e.g. international numbers or specific numbers; 2) media used in the communication, e.g. audio, video, or text.

The scope definition of what kind of conditions can be present in those rules is not specified. The OpenCloud implementation of those rules follows the simservs RuleSet definition (TS 29.364 ) for MMTelICB Supported Barring Rule Conditions and MMTelOCB Supported Barring Rule Conditions. This way the operator can define the same MMTel barring conditions supported by the MMTelOCB and MMTelICB features.

The Sentinel VoLTE TAS provides an extension to standard Operator Specific Barring that allows the operator to retarget outbound calls to an arbitrary destination. See How to provision the Operator Specific Barring rules for details of how to enable this functionality, and MMTelOCB Behaviour for details of how it is executed.

== ODB-Specific Conditions

There are conditions that are unique to ODB. These are:

=== Incoming Communications

To make a rule match on any communications that are 'incoming', add the <incoming /> element to its set of conditions.

Example:

<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy">
    <cp:rule id="barr-alice-incoming">
        <cp:conditions>
            <incoming />
            <cp:identity>
                <one id="sip:alice@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Outgoing Communications

To make a rule match on any communications that are 'outgoing', add the <outgoing /> element to its set of conditions.

Example:

<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy">
    <cp:rule id="barr-alice-outgoing">
        <cp:conditions>
            <outgoing />
            <cp:identity>
                <one id="sip:alice@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

== How to Provision the Operator Specific Barring Rules

Definitions for each of the four allowed operator specific barring rules are provided on the MMTelOdbOperatorSpecificTypeRuleProfileTable. Each profile on the table corresponds to one of the four types. Profiles are named with the format: {sentinel-selection-key}:{rule-type}, for example:

Metaswitch:Metaswitch::::Type1

Each profile has the following fields:

Name Type Default Value Description 
OperatorSpecificType

String (Enum)

 
null

Identifies the type of the rule, should match the profile name, must be equal to one of: Type1, Type2, Type3, or Type4.

 
Rule

String

 
null

The cp:ruleset XML for the entire OSB rule.

 
Retarget

boolean

 
false

A flag to indicate whether this rule should retarget the call when the result of evaluating the cp:ruleset indicates the call should be barred.

 
RetargetURI

String

 
null

The new target URI that should be used when retargeting a call. If the Retarget flag is true, this field must contain a valid sip: or tel: URI.

 
PlayRetargetAnnouncement

boolean

 
false

A flag that indicates whether an announcement should be played if this rule triggers retargeting. This only applies if the Retarget flag is true.

 
RetargetAnnouncementID

int

 
0

The ID of the announcement that should be played if the retarget announcement is triggered. If this is 0 no announcement will be played.

 
DisableOnlineChargingOnRetarget

boolean

 
false

A flag that indicates whether online charging should be suppressed if this rule retargets the call.

Note that redirection behaviour only applies to outbound calls on an originating or forwarded TAS instance. When applied to inbound calls on a terminating TAS instance, Operator Specific Barring rules will execute standard barring behavior regardless of any retarget configuration on this profile table.

== Examples

The sections below show XML data stored in the Rule field of each profile on the MMTelOdbOperatorSpecificTypeRuleConfigProfileTable. The values can be applied for type 1 to type 4. The fact that the <incoming\> and <outgoing\> are not present, means that those rules will be applied to both directions.

=== Bar Video

<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy">
    <cp:rule id="no_video">
        <cp:conditions>
            <media>video</media>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Bar Identity

<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy">
    <cp:rule id="barr-alice">
        <cp:conditions>
            <cp:identity>
                <one id="sip:alice@example.com"/>
            </cp:identity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

=== Bar Specific Domain for a One Month Period

<cp:ruleset xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy">
    <cp:rule id="barr-domain">
        <cp:conditions>
            <cp:identity>
                <many domain="example.com"></many>
            </cp:identity>
            <cp:validity>
                <cp:from>2016-01-01T00:00:00</cp:from>
                <cp:until>2016-01-31T23:59:59</cp:until>
            </cp:validity>
        </cp:conditions>
        <cp:actions>
            <allow>false</allow>
        </cp:actions>
    </cp:rule>
</cp:ruleset>

= Prefix Based Barring :toc: macro :toclevels: 4 :toc-title: On this page…​

Prefix Based Barring provides a mechanism for an operator to augment the implicit or explicit condition of a MMTelOCB barring rule, so that the rule will also apply when the called party number matches some prefix with optional length criteria .

== What is Prefix Based Barring

Prefix Based Barring is an enhancement to Outgoing Call Barring, to trigger certain barring treatments based on the dialled number.

== How to Configure Prefix Based Barring

=== ${platform.operator.name}_PrefixBarring_AddressListEntryTable

An address list called ${platform.operator.name}_PrefixBarring_AddressListEntryTable is used to classify the called number for prefix based barring.

It is an extension of the standard Address List Entry Profile and has the same structure with the following additional field.

Parameter Type Description

…​

…​

…​

NumberClassification

String[]

A list of 1 or more items where each is the name of a PrefixBarringClassificationsTable profile. REM provides a list from which elements of the array may be selected.

=== PrefixBarringClassificationsTable

The prefix barring address list references a classification for the matching prefixes.

Details of how that classification is treated are stored in PrefixBarringClassificationsTable profile table.

Attribute Name Type Default Description 
ClassificationID

String

n/a

The identifier of this classification, and the name of this profile.

 
DisplayName

String

n/a

User readable name for the classification that will be used to select it in the address list.

 
MatchMinLength

Integer

no minimum length criteria

The minimum number of digits in dial string to match this classification.

 
MatchMaxLength

Integer

no maximum length criteria

The maximum number of digits in dial string to match this classification.

 
MatchInternational

boolean

false

When true, this classification will only match international targets.

 
BarringTreatment

String

n/a

How to treat matching calls. See below.

 
OverrideOCBAnnouncement

boolean

n/a

When set to true AnnouncementID will override the generic outbound call barring announcement configuration if its PlayAnnouncement value is true.

 
AnnouncementID

int

n/a

An announcement to be played when a matching number is called and barred and OverrideOCBAnnouncement is set and the generic outbound call barring announcement configuration’s PlayAnnouncement value is true. Set to 0 to play no announcement.

=== Barring Treatments

BarringTreatment Description

OperatorAllow

The call will not be barred.

OperatorBar

The call will be barred if no OSB rules or OperatorAllow treatment allows it.

OSBType1

Operator Specific barring rules will be processed as though the <conditions> for Type1 barring evaluated to true.

OSBType2

Operator Specific barring rules will be processed as though the <conditions> for Type2 barring evaluated to true.

OSBType3

Operator Specific barring rules will be processed as though the <conditions> for Type3 barring evaluated to true.

OSBType4

Operator Specific barring rules will be processed as though the <conditions> for Type4 barring evaluated to true.

PremiumRateInformation

Premium-rate communication barring options will be processed as though the call was classified with premium-rate set to information.

PremiumRateEntertainment

Premium-rate communication barring options will be processed as though the call was classified with premium-rate set to entertainment.

=== Configuring an OSB rule to only be triggered by a prefix

Note If an OSB rule is being configured solely to be triggered by prefix barring then use <rule-deactivated/> as the rule’s condition so that it is not inadvertently triggered otherwise.

== Behaviour

Before other OCB rules are applied, the feature extracts the target from the Request URI. The target consists of the dialled digit string, and any international number indicator. If no digits can be found ODB and OCB proceed as normal.

The target will have had normalisation applied.

If the target is international but within the home country code, the home country code prefix is stripped from the digits, and the target is treated as national.

The feature attempts longest prefix matching of the target’s digits in the address list. If no address list entry is found ODB and OCB proceed as normal.

If an address list entry is found the NumberClassification values are used to retrieve corresponding profiles from the PrefixBarringClassificationsTable.

For each of these classification profiles in specified order:

  • If the national/international indicator of the target conflicts with the classification’s MatchInternational value, that profile is discarded.

  • If the number of digits in the target conflicts with the MatchMinLength or MatchMaxLength values in the profile, that profile is discarded.

If there are no remaining profiles ODB and OCB proceed as normal.

If more than one remaining profile has the same BarringTreatment value, the stats counter FoundConflictingPrefixBarringClassifications is incremented and all except the first of those profiles are discarded. This avoids having more than one applicable announcement configuration for an applied rule.

If one of the remaining profiles has a treatment of OperatorAllow, the call is allowed and the OCB feature completes.

If the subscriber has ODB data provisioned, then Operator-specific ODB rules are applied, except the condition of each rule is assumed true if any of the remaining profiles has a BarringTreatment value corresponding to the OSB rule type. If any of the remaining profiles has a treatment of OperatorBar that takes precedence over any Operator-specific ODB rules that bar, but not those that whitelist. The classification with OperatorBar treatment may override the announcement settings.

If an OSB rule bars the call due to a prefix barring treatment, and does not retarget it, then the profile may override the announcement settings.

Premium-rate communication barring options are then evaluated against PremiumRateInformation and/or PremiumRateEntertainment BarringTreatment values. If the call is barred due to any of these, then the profile may override the announcement settings.

See Bar Outgoing Premium-Rate Communication for more information on premium-rate communication barring.

If the subscriber has no ODB data, then any profiles with a treatment of OperatorBar will be applied, but profiles with OSB rule types or premium-rate communication barring will have no effect.

If the call has not been barred or allowed, ODB and OCB proceed as normal.

= Determine Shared And Undisclosed Identities :toc: macro :toclevels: 4 :toc-title: On this page…​

This feature uses information from a SIP INVITE and session state to determine if the call includes shared or undisclosed identity information associated with a companion device. The feature is run in both originating and terminating session execution plans.

== Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

MMTEL

Yes

Originating and Terminating

MMTelOrig_SipAccess_SubscriberCheck, MMTelTerm_SipAccess_SubscriberCheck

Yes

Yes

Stateless

POJO

== Prerequisite features

These features must run before DetermineSharedUndisclosedIdentities:

  • SubscriberDataLookupFromHlr/SubscriberDataLookupFromHss

== Session input variables

Session State variable name Variable type 
SentinelSelectionKey

SentinelSelectionKey

 
MetaswitchCompanionDevice

CompanionDeviceData

 
Subscriber

String

== Session output variables

Session State variable name Variable type Comments 
SharedIdentitySip

String

SIP shared identity used by the companion device.

 
SharedIdentityTel

String

TEL shared identity used by the companion device.

 
UndisclosedIdentity

String

The undisclosed identity of the companion device.

 
HideUndisclosedIdentities

Boolean

Set to true if call is to the undisclosed identity of the companion device. Used by the HideUndisclosedIdentity feature.

 
BarIncomingCall

Boolean

Set to true if the call is made to undisclosed identity and configuration is set to bar.

== Network operator data This feature reads HideUndisclosedIdentities in the feature configuration profile table HideUndisclosedIdentityConfigProfileTable to determine if the feature should execute.

Parameter Type Description Default 
HideUndisclosedIdentities

Boolean

Determines if calls to Undisclosed Identities should be hidden.

true

== Statistics

DetermineSharedUndisclosedIdentities statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → DetermineSharedUndisclosedIdentities
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.DetermineSharedUndisclosedIdentities"

Name Type Description 
Started

Counter

Incremented each time the feature runs

 
FailedToStart

Counter

Incremented when a fatal error occurs before feature execution

 
IssuedWarning

Counter

Incremented when a non-fatal error occurs during feature execution

 
FailedDuringExecution

Counter

Incremented when a fatal error occurs during feature execution

 
TimedOut

Counter

Incremented when feature execution does not complete within a reasonable time frame

 
UnableToDetermineUndisclosedIdentity

Counter

Incremented when the feature fails to find the subscriber id, sharedIdentitySip, and sharedIdentityTel when determining if undisclosed and shared identity logic should be applied.

 
SubscriberIsUndisclosedIdentity

Counter

Incremented if the subscriber is a companion device undisclosed identity.

 
SubscriberIsSharedIdentity

Counter

Incremented if the subscriber is a companion device shared identity.

 
HideUndisclosedIdentities

Counter

Incremented if the subscriber is undisclosed and the call will be barred.

== Behaviour

The feature checks session state, feature configuration, and the incoming SIP request in order to set session state fields, which are subsequently used by downstream features associated with companion calls.

  • If triggered in the originating execution plan the feature sets session state fields to hide the companion device number from the callee.

  • If triggered in the terminating execution plan, when the call is made to an undisclosed identity, then the feature sets the BarIncomingCall session state field. This is used by the General Barring feature to bar the incoming call.

=== Values examined

Value Name Source Notes 
MetaswitchCompanionDevice

Session State

Store information used to determine if the call is from or to a companion device.

 
SharedIdentitySip

Session State

Set by the DetermineSharedUndisclosedIdentities feature which is used by the HideUndisclosedIdentity feature.

 
SharedIdentityTel

Session State

Set by the DetermineSharedUndisclosedIdentities feature which is used by the HideUndisclosedIdentity feature.

 
UndisclosedIdentity

Session State

Set by the DetermineSharedUndisclosedIdentities feature.

 
HideUndisclosedIdentities

Session State

Flag set by the DetermineSharedUndisclosedIdentities feature to indicate to the HideUndisclosedIdentity feature to "hide" the identity of the caller by replacing SIP headers with the shared identity of the companion device.

 
BarIncomingCall

Session State

Set by the DetermineSharedUndisclosedIdentities feature which is used by the GeneralBarring Feature to bar the call.

= DetermineRoamingFromHlr :toc: macro :toclevels: 4 :toc-title: On this page…​

DetermineRoamingFromHlr is responsible for reading subscriber location data from the HLR and writing it into Sentinel session state variable fields.

The data it reads from the HLR is accessed through the AnyTimeInterrogation MAP operation. The Application Context used is anyTimeInfoEnquiryContext_v3_ac

== Feature cheat sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature Other notes

MMTel

Yes

Originating, Forwarding, and Terminating

SipAccess_SessionCheck, and SipAccess_PartyResponse

Yes

Yes

Stateless

POJO

== Prerequisite features

  • SubscriberDetermination

  • FetchCMSISDN

  • DetermineChargeMode (only required when using CAP charging)

== Session state input variables

Attribute Name Type 
Subscriber

String

 
CMSISDN

String

 
ChargeMode

Enum

== Session state output variables

Attribute Name Type Description 
RoamingStatus

Enum

UNKNOWN, NATIONAL or INTERNATIONAL

 
RoamingIndicator

boolean

false if not roaming, true otherwise

 
AttemptedATI

boolean

true if an AnyTimeInterrogation has been attempted by the feature, false otherwise

 
DiscoveredAccessNetworkInformation

String

3GPP-GERAN;cgi-3gpp=<mnc><mcc><lac><ci>;network-provided, where <ci> defaults to 0000 when not provided in the ATI response

 
SubscriberLocationMscAddress

AddressString

MSC Address extracted from MAPLocationInformation returned by AnyTimeInterrogation response.

Note: The default values for both RoamingStatus and RoamingIndicator are UNKNOWN and false respectively. If this feature is unable to determine the roaming status for any reason, it will leave the pre-set values.

== Configuration

The feature uses configuration data from both the HLR MAP Configuration and SIP Sentinel Configuration.

== Statistics

DetermineRoamingFromHlr statistics are tracked by the DetermineRoamingFromHlr feature and can be found under the following parameter set:
SLEE-Usage ▶ sentinel.volte.sip service ID ▶ sentinel.volte.sip SBB ID ▶ DetermineRoamingFromHlr.

Name Type Description 
Started

Counter

Incremented each time the feature runs

 
FailedToStart

Counter

Incremented when Sentinel VoLTE encounters an error while attempting to start the feature

 
IssuedWarning

Counter

Incremented when a non-fatal problem is encountered and the feature issues a warning

 
FailedDuringExecution

Counter

Incremented when a fatal problem is encountered and the feature cannot execute correctly

 
TimedOut

Counter

Incremented when the feature takes too long to complete and Sentinel VoLTE aborts execution

 
RequestSent

Counter

Incremented when the feature receives subscriber data from the HLR

 
RequestSuccessful

Counter

Incremented after the feature successfully processes the data it received, and loads it into session state fields

 
RequestFailed

Counter

Incremented when absent configuration data prevents the feature from running

 
ResponseLatency

Sampled

Records elapsed time between sending the request to the HLR and getting a response (in milliseconds).

 
InternationalRoaming

Counter

Incremented when the feature determines that the subscriber is roaming internationally

 
NotRoaming

Counter

Incremented when the feature determines that the subscriber is not roaming

 
NationalRoaming

Counter

Incremented when the feature determines that the subscriber is national roaming

 
RoamingDataMissingFromHlrResponse

Counter

Incremented whenever an ATI result comes back from Hlr with missing or invalid location information

 
DialogOpenRefuseEvent

Counter

Incremented whenever the ATI fails due to a dialog open refuse

 
DialogUserAbortEvent

Counter

Incremented whenever the ATI fails due to a dialog user abort

 
DialogProviderAbortEvent

Counter

Incremented whenever the ATI fails due to a dialog provider abort

 
OperationErrorEvent

Counter

Incremented whenever the ATI fails due to an operation error

== Behaviour

This feature uses the CGIN MAP RA to query the HLR with an ATI for subscriber location information.

Each time the feature is invoked, it checks the call type and determines the subscriber number that it should use to query the HLR.

When invoked on a SIP response the feature checks whether a request to the HLR has not already been made and whether there is an OC-Terminating-Domain present in the SIP responses with value CS. If either is not the case then the feature finishes execution.

The feature attempts to extract "phone number digits" from the CMSISDN session state field set by FetchCMSISDN, and if it cannot, from the Subscriber field set by SubscriberDetermination. If the feature cannot form a MSISDN it raises a Feature Error and finishes execution.

The feature then requests subscriber location info by sending a AnyTimeInterrogation request to the configured HLR.

In order to form the ATI request the feature:

  1. sets the GSM SCF address to the SentinelSCCPAddress configuration value

  2. sets the destination SCCP address to the HlrSCCPAddress configuration value

  3. sets the RequestedInfo indicator field to request Location Information

If a successful result is received, it retrieves location information from the ATI result. The location information can be in either of the CellGlobalIdOrServiceAreaIdFixedLength or LaiFixedLength fields. If neither field is present, the feature increments the RoamingDataMissingFromHlrResponse stat. It will then check whether the MAPLocationInformation contains an MSC number, and if so, it will write this to the session state field SubscriberLocationMscAddress.

If the location information is found, the MCC and MNC are evaluated using the PLMN ID Analyser Component to determine whether the subscriber is roaming or not. The RoamingStatus and RoamingIndicator session state fields are then set accordingly. Their default values in the case of incomplete information or feature failure are UNKNOWN and false respectively.

If found, the location information is also used to generate a discovered network access information. If no other access network information is available, this will be used in charging content AVPs. The format for the generated information is 3GPP-GERAN;cgi-3gpp=<cgi>;network-provided, where <cgi> is the Cell Global ID, made up of the MCC, MNC, Location Area Code (in hex) and Cell Id (in hex) concatenated. If the Cell Id is not provided by the HLR, it will default to 0000.

=== OC-Roaming-Status Header

If the feature is running on a terminating MMTel instance, and CAP charging is enabled, it will attempt to add an OC-Roaming-Status header to the outbound request. The value of the header will be set to match the value of RoamingStatus.

= Diameter MMTel Information :toc: macro :toclevels: 4 :toc-title: On this page…​

This feature records charging information about MMTel supplementary services invoked on a call.

The feature name is DiameterMMTelInfo, as it is based on 3GPP TS 32.299 v12.11.0 (vcb0).

== Feature cheat-sheet

B2BUA Instance SAS Support Originating / Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

MMTEL

No

Originating and Terminating

  • SipAccess_PartyRequest

  • SipAccess_PartyResponse

  • SipAccess_SubscriberCheck

  • SipAccess_ServiceTimer

  • SipMidSession_PartyRequest

  • SipMidSession_PartyResponse

  • SipMidSession_CreditAllocatedPostCC

  • SipMidSession_CreditLimitReachedPostCC

  • SipMidSession_OCSFailurePostCC

  • SipLegEnd

  • SipEndSession

No

No

Stateless

POJO

== Session state inputs and outputs

=== Inputs

Name Type Purpose

CallType

Enum

Used to set the Subscriber-Role AVP.

RanOip

boolean

If true, adds Supplementary-Service AVP indicating that OIP was used on the call.

RanOir

boolean

If true, adds Supplementary-Service AVP indicating that OIR was used on the call.

RanTip

boolean

If true, adds Supplementary-Service AVP indicating that TIP was used on the call.

RanTir

boolean

If true, adds Supplementary-Service AVP indicating that TIR was used on the call.

RanIcb

boolean

If true, adds Supplementary-Service AVP indicating that ICB was used on the call.

RanOcb

boolean

If true, adds Supplementary-Service AVP indicating that OCB was used on the call.

RanCW

boolean

If true, adds Supplementary-Service AVP indicating that CW was used on the call.

RanHOLD

boolean

If true, adds Supplementary-Service AVP indicating that HOLD was used on the call.

LastDiversionType

Enum

Used to populate the CDIV Supplementary-Service AVP.

DiversionCounter

int

Used to populate the CDIV Supplementary-Service AVP.

Subscriber

String

Used to populate the Associated-Party-Address AVP in the CDIV Supplementary-Service AVP.

=== Outputs

Name Type Description

MMTelInformation

MmtelInformation

The MMTel-Information AVP that will be written to a CDR, or sent in a Credit-Control-Request. This AVP is defined in 3GPP TS 32.299 v12.11.0 §7.2.111. Contains information about the MMTel supplementary services invoked during the call.

== Behaviour

The DiameterMMTelInfo feature populates the Diameter Ro MMTel-Information AVP with information about supplementary services used in the call. The feature stores an MMTel-Information AVP in session state, and updates it at various feature execution points when other supplementary services have run. The resulting MMTel-Information AVP is used by the VolteSipAvpCdr feature when writing a CDR. The MMTel-Information AVP is also sent in the final Credit-Control-Request to the OCS.

= Flexible Alerting Features :indexpage:

Flexible Alerting Features

Feature What it does

MMTel Determine Flexible Alerting Mode

determines if and how the Flexible Alerting features will execute based on feature configuration and the HSS Subscriber Data.

MMTelParallelFA

implements the Flexible Alerting service, by alerting the group members in parallel

MMTelSequentialFA

implements the Flexible Alerting service, by sequentially alerting the group members.

= MMTel Determine Flexible Alerting Mode :toc: macro :toclevels: 4 :toc-title: On this page …​

The MMTelDetermineFlexibleAlertingMode feature determines if and how the Flexible Alerting features will execute based on feature configuration and the HSS Subscriber Data. .

The Determine Flexible Alerting Mode feature runs before the Flexible Alerting features. It reads subscriber data and configuration profile tables to determine the flexible alerting mode and supplies this information to the MMTelParallelFA and MMTelSequentialFA features as a session state field.

== Feature cheat sheet

B2BUA Instance SAS Support Originating/Terminating Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

All

No

Terminating

Subscriber Check

Yes

Yes

Stateless

POJO

== Prerequisite features

== Network Operator Data

The data present in JSLEE profile table MMTelDetermineFAConfigProfileTable is used to configure the behaviour of the Flexible Alerting features: MMTelParallelFA and MMTelSequentialFA. This profile table is scoped by the sentinel key and the Pilot Number.

Here is an example of a profile entry:

'SomeOperatorName::::sip:callcentre@someoperator.com':
            ModeIsParallel: true
            ParallelMaxWaitTimeout: 5000
            SequentialAnyResponseTimeout: 2000
            SequentialFinalResponseTimeout: 5000
            AddHistoryInfoHeader: false
            AddMpParam: false

The default profile entry is not scoped by a Pilot Number:

'SomeOperatorName::::':
            ModeIsParallel: true
            ParallelMaxWaitTimeout: 5000
            SequentialAnyResponseTimeout: 2000
            SequentialFinalResponseTimeout: 5000
            AddHistoryInfoHeader: false
            AddMpParam: false
Variable Name Type Comments 
ParallelMaxWaitTimeout

int

Set the amount of time in milliseconds that the MMTelParallelFA waits for a final response before canceling the session for a pilot number.

 
ModeIsParallel

boolean

Set the mode to parallel (true) or sequential (false).

 
SequentialAnyResponseTimeout

int

Set the amount of time in milliseconds that the MMTelSequentialFA waits for a any response from the INVITE before start alerting the next member.

 
SequentialFinalResponseTimeout

int

Set the amount of time in milliseconds that the MMTelSequentialFA waits for a final response from the INVITE before start alerting the next member.

 
AddHistoryInfoHeader

boolean

Determines whether to add History-Info headers to the outgoing requests.

 
AddMpParam

boolean

If adding History-Info headers, determines whether to add hi-target-param headers (of type mp) to the added hi-entry.

== Session Input Variables

Variable Name Type Comments 
bxref:mmtel-subscriber-data-representation#mmtelfaservicedata[MMTelFAServiceData]

Complex

Read from the HSS in SubscriberDataLookupFromHSS

== Session Output Variables

Variable Name Type Comments 
FlexibleAlertingMode

Enum

Determines whether the FA Group will be alerted in sequential or parallel way or if none of the flexible alerting features will run. Possible values are: NONE, PARALLEL or SEQUENTIAL.

 
FlexibleAlertingGroupMode

Enum

Determines whether the FA Group is of type single-user or multiple-users. Possible values are: GROUP_NONE, SINGLE_USER or MULTIPLE_USERS

== Statistics

MMTelDetermineFAMode statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → MMTelDetermineFAMode
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.MMTelDetermineFAMode"

Statistic Type Incremented when…​ 
Started

Counter

each time the feature runs

 
FAModeStarted

Counter

each time the feature runs

 
FailedDuringExecution

Counter

a fatal error occurs while the feature is executing

 
FailedToStart

Counter

Sentinel VoLTE encounters an error while attempting to start the feature.

 
IssuedWarning

Counter

a non-fatal problem is encountered and the feature issues a warning.

 
TimedOut

Counter

the feature takes too long to complete and Sentinel VoLTE aborts execution.

 
FAModeNoFA

Counter

the feature fails to trigger Flexible Alerting under FA mode

 
FANoProfile

Counter

no valid profile is loaded for poilt subscriber

 
FAValidPilotNumber

Counter

subscriber data equals the requestUri header.

 
FallbackToNetworkDefaultServiceConfig

Counter

incremented when the feature uses the network default service configuration as the session state does not contain the feature specific subscriber service data.

== Behaviour

When the feature starts, it tries to load the configuration profile for the pilot number present in the flexible alerting subscriber data. The table MMTelDetermineFAConfigProfileTable is expected to contain a profile with name scoped by the sentinel selection key and the Pilot Number, i.e, SomeOperatorName::::sip:callcentre@someoperator.com.

If there is no profile for the pilot number the feature try to get the configuration from the default profile: SomeOperatorName::::.

When there is no suitable profile the FlexibleAlertingMode is set to NONE and the FlexibleAlertingGroupMode is set to GROUP_NONE. It means that the neither MMTelParallelFA nor MMTelSequentialFA will run.

When there is a suitable profile, the feature checks if the flexible-alerting is active by checking the authorized field in the flexible-alerting Subscriber Data. If the service is not active, i.e authorized="false", neither MMTelParallelFA nor MMTelSequentialFA will run. The HSS schema for flexible alerting defines two sets of services that can contain the key authorized: operator-flexible-alerting and operator-flexible-alerting-group. The feature checks both to define if the service is authorized. The table below shows the logic:

operator-flexible-alerting authorized
 
operator-flexible-alerting-group authorized
 
service status
 
true
 
true
 
active
 
true
 
null
 
active
 
null
 
true
 
active
 
false
 
any
 
inactive
 
any
 
false
 
inactive
 
null
 
null
 
inactive

When flexible alerting is active, the group type in the Subscriber Data (single-user or multiple-users) is written into the Session State variable FlexibleAlertingGroupMode. The FlexibleAlertingMode Session State field is set according to the value in the configuration profile (ModeIsParallel attribute).

== Subscriber data examples === MULTIPLE_USERS

HSS Subscriber Data

<?xml version="1.0" encoding="UTF-8"?>
<Sh-Data>
    <RepositoryData>
        <ServiceIndication>MMTEL-Services</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
            <MMTelServices
                xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap"
                xmlns:cp="urn:ietf:params:xml:ns:common-policy">
                <complete-flexible-alerting>
                    <operator-flexible-alerting authorized="true"/>
                    <operator-flexible-alerting-group authorized="true">
                        <identity>sip:friends@home1.opencloud.co.nz</identity>
                        <group-type>multiple-users</group-type>
                        <membership>permanent</membership>
                        <members>
                            <member active="true">sip:bob@home1.opencloud.co.nz</member>
                            <member active="true">sip:charlie@home1.opencloud.co.nz</member>
                            <member active="true">sip:daisy@home1.opencloud.co.nz</member>
                        </members>
                    </operator-flexible-alerting-group>
                </complete-flexible-alerting>
            </MMTelServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

Profile configuration

ModeIsParallel: true
ParallelMaxWaitTimeout: 20000
SequentialAnyResponseTimeout: 2000
SequentialFinalResponseTimeout: 5000

In the example above, the group sip:friends@home1.opencloud.co.nz has three active members. The FlexibleAlertingGroupMode is set to MULTIPLE_USERS , the FlexibleAlertingMode is set to PARALLEL, and the timeout is set to 20 seconds.

=== SINGLE_USER

HSS Subscriber Data

<Sh-Data>
    <RepositoryData>
        <ServiceIndication>MMTEL-Services</ServiceIndication>
        <SequenceNumber>1</SequenceNumber>
        <ServiceData>
            <MMTelServices
                xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap"
                xmlns:cp="urn:ietf:params:xml:ns:common-policy">
                <complete-flexible-alerting>
                    <operator-flexible-alerting authorized="true"/>
                    <operator-flexible-alerting-group authorized="true">
                        <identity>sip:bob@home1.opencloud.co.nz</identity>
                        <group-type>single-user</group-type>
                        <membership>permanent</membership>
                        <members>
                            <member active="true">sip:bob@home1.opencloud.co.nz</member>
                            <member active="true">sip:bob-mobile@home1.opencloud.co.nz</member>
                            <member active="true">sip:bob-desk@home1.opencloud.co.nz</member>
                        </members>
                    </operator-flexible-alerting-group>
                </complete-flexible-alerting>
            </MMTelServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

Profile configuration

ModeIsParallel: false
ParallelMaxWaitTimeout: 5000
SequentialAnyResponseTimeout: 2000
SequentialFinalResponseTimeout: 5000

In the example above, the group sip:bob@home1.opencloud.co.nz has three active members. The FlexibleAlertingGroupMode is set to SINGLE_USER, the FlexibleAlertingMode is set to SEQUENTIAL and the timeout is for receiving any response from a member is set to 2 seconds and the timeout for receiving a final response from a member is 5 seconds.

= MMTelParallelFA :toc: macro :toclevels: 4 :toc-title: On this page…​

The MMTelParallelFA feature implements the Flexible Alerting service, by alerting the group members in parallel

== Feature Cheat Sheet

B2BUA Instance Originating / Terminating SAS Support Point(s) in Session Plan Network Operator Data Subscriber Data Stateful or Stateless POJO Feature or SBB Feature

MMTEL

No

Terminating

Sip_Access_Subscriber_Check, Sip_Access_Party_Request, Sip_Access_Party_Response, Sip_Access_Service_Timer, SipMidSession_Party_Request, Sip_Mid_Session_Party_Response, SipLegEnd

Yes

Yes

Statefull

POJO

== Statistics

MMTelParallelFA statistics are tracked by the sentinel.volte.sip SBB and can be found under the following parameter set in REM:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → MMTelParallelFA
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.1].feature.MMTelParallelFA"

Name Type Incremented when …​

Started

Counter

each time the feature runs

FailedDuringExecution

Counter

a fatal error occurs while the feature is executing

FailedToStart

Counter

Sentinel VoLTE encounters an error while attempting to start the feature.

IssuedWarning

Counter

a non-fatal problem is encountered and the feature issues a warning.

TimedOut

Counter

the feature takes too long to complete and Sentinel VoLTE aborts execution

ProcessingRequest

Counter

processing a request message.

ProcessingResponse

Counter

processing a response from the downstream forked legs.

InviteRequestReceived

Counter

the original INVITE is received.

CancelRequestReceived

Counter

a CANCEL message is received.

ProvisionalResponseReceived

Counter

a 1xx message is received.

GroupMemberAlerted

Counter

an INVITE request is sent to a group member.

LegReleased

Counter

a dialog leg is released.

UpstreamForkCreated

Counter

the feature creates a new leg towards the calling party. It happens on the provisional responses.

TriggeredOnResponse

Counter

the feature is triggered on a response message.

TriggeredOnRequest

Counter

the feature is triggered on a request message.

TriggeredOnTimer

Counter

the feature is triggered on a timmer.

TimeoutTimerCancelled

Counter

the feature cancel the timer.

TimeoutTimerSet

Counter

the feature sets the timer. The timer is set before the INVITE is sent to the first group member.

ExitedEarlyNoMembersToAlert

Counter

there is just one member in the group and it is the pilot number.

Received480

Counter

receives a 480 (Temporarily Unavailable) response from a member

Received486

Counter

receives a 486 (Busy Here) response from a member

Received408

Counter

receives a 408 (Timeout) response from a member

Received404

Counter

receives a 404 (Not found) response from a member

ReceivedSuccess

Counter

receives a 200 (OK) response from a member

RespondedUpstreamWith480

Counter

the feature sends a 480 (Temporarily Unavailable) to the calling party.

RespondedUpstreamWith486

Counter

the feature sends a 486 (Busy Here) to the calling party.

RespondedUpstreamWith408

Counter

the feature sends a 408 (Timeout) to the calling party.

RespondedUpstreamWith404

Counter

the feature sends a 404 (Not found) to the calling party.

RespondedUpstreamWithSuccess

Counter

the feature sends a 200 (OK) to the calling party.

== Interaction with other MMTel Services

=== CDIV Unconditional

If CDIV Unconditional is active for the Pilot Identity, CDIV Unconditional procedures will be applied and no FA group member will be alerted.

=== CDIV Busy

If CDIV Busy is active for the Pilot Identity, CDIV Busy procedures will be applied if the pilot number is considered busy. The definition of Busy for the pilot number depends on the group type: single-user or multiple-users. For single-user, when one member is busy the pilot number is busy, while for multiple-uses all group members have to be busy for the pilot number to be considered busy.

=== CDIV No Reply and CDIV Not Reachable

If the FA Pilot Number is considered in a state of No Reply or Not Reachable then the CDIV procedures for those MMTel services will be applied.

=== CDIV Not Logged-in

If the FA Pilot Identity has CDIV Not Registered active, the procedures for CDIV Not Registered will be applied.

=== MMTelOIP

OIP applied to any FA group member when OIP is active for the FA Pilot Identity.

=== MMTelTIP

If the FA Pilot Identity did not apply TIR, the termination identification is the FA Pilot Identity.

=== MMTelTIR

If the FA Pilot Identity has TIR activated, the termination identification is not presented.

=== MMTelICB

If the FA Pilot Identity has ICB activated, the procedures for ICB will be applied.

=== MMTelOCB

If any FA group member has OCB activated, the procedures for OCB will be applied for that member.

== Network Operator Data

The data present in JSLEE profile table MMTelDetermineFAConfigProfileTable is used to configure the behaviour of the Parallel Flexible Alerting feature.

Variable Name Type Comments 
ParallelMaxWaitTimeout

int

Set the amount of time in milliseconds that the MMTelParallelFA feature waits before canceling the session for a pilot number.

 
AddHistoryInfoHeader

boolean

Determines whether to add History-Info headers to the outgoing requests.

 
AddMpParam

boolean

If adding History-Info headers, determines whether to add hi-target-param headers (of type mp) to the added hi-entry.

== Session Input Variables

Variable Name Type Comments 
MMTelFAServiceData

Complex

Service data read from the HSS

 
FlexibleAlertingGroupMode

Enum

Determines whether single user or multi-user Flexible Alerting is used.

== Session Output Variables

Variable Name Type Comments 
SuppressCdiv

Boolean

Indicates whether response should be ignored by the MMTel CDIV feature.

 
ParallelFATimerID

int

Indicates the MMTelParallelFA timer identification.

 
StripPreconditionsLegNames

<Set>String

The MMTelParalleFA adds each parallel legname to this Set which is used by the StripPreconditions feature to remove preconditions (if StripPreconditions EnabledFlag is selected).

== Behaviour

The MMTelParallelFA implements the Flexible Alerting in parallel. It reads the MMTelFAServiceData session variable for the group information and issues INVITE requests towards all members in parallel using SIP parallel forking.

The INVITE request URI will have two parameters added to it.

When a member answers the call with 200 (OK) the feature cancels all other sessions towards the other members and finishes the call setup procedures between the calling party and the member that answered.

It also controls the state of the FA Pilot Identity regarding busy, not reachable and no reply states. The determination of those states, depends on the members responses and on the FA group type: single-user or multiple-users. For further information regarding the state of a Pilot Identity see Flexible Alerting.

== OC-Retarget Header

The OC-Retarget header is added by MMTel Flexible Alerting to communicate that a retarget has occurred. This header is inserted into the initial INVITEs that goes towards the retargeted party. This is then used in the composition to decide whether to invoke the SCC-AS.

For more details see OC-Retarget Header

== Parallel Flexible Alerting and MMTelCDIV interaction

The CDIV feature runs before the Flexible Alerting feature on INVITE path. This way, the CFNL and CFU conditions can be applied to the Pilot Number before alerting any FA-Group member.

On the Response path, the CDIV feature runs after the Flexible Alerting feature. CDIV applies the conditions CFB, CFNR, and CFNRc based on the final response that the MMTelParallelFA feature sends to the caller. To avoid the CDIV feature being triggered on any final FA-Group members response, the MMTelParallelFA feature suppresses the CDIV feature execution by setting the session state variable SuppressCdiv. MMTelParallelFA will allow the CDIV feature to execute only after the the state of the Pilot Number is defined by receiving all members final responses or by timing out.

CDIV and MMTelParallelFA are both triggered on each other timers. This guarantees that the MMTelParallelFA feature cancels the ongoing downstream dialogs and that the CDIV feature can execute the CFNR and CFNRc conditions properly.

When the CDIV timer fires first, the MMTelParallelFA feature cancels the downstream dialogs and sends a 408 (Timeout) response towards the caller party. When CDIV executes, it will identify the 408 response and do the proper re-targeting towards the diverted subscriber.

When the MMTelParallelFA timer fires first, the MMTelParallelFA feature stops the CDIV timer and cancels the downstream dialogs and sends a 408 (Timeout) response towards the caller party. When CDIV executes, it identifies the trigger is the MMTelParallelFA timer, identifies the 408 response and do the proper re-targeting towards the diverted subscriber.

In the case when no timer has been fired, CDIV feature uses the sip response sent from the MMTelParallelFA feature to evaluate and execute the proper MMTelCDIV conditions.

== HSS Subscriber Data Examples

=== single user group type

In the first example the Subscriber Data configures a flexible alerting group with type single-user. The group has three active members and the flexible alerting service is authorized or active.

<?xml version="1.0" encoding="UTF-8"?>
  <Sh-Data>
    <RepositoryData>
        <ServiceIndication>MMTEL-Services</ServiceIndication>
       <SequenceNumber>1</SequenceNumber>
        <ServiceData>
            <MMTelServices  xmlns="http://uri.etsi.org/ngn/params/xml/simservs/xcap" xmlns:cp="urn:ietf:params:xml:ns:common-policy">
                <complete-flexible-alerting>
                    <operator-flexible-alerting authorized="true"/>
                    <operator-flexible-alerting-group authorized="true">
                        <identity>sip:bob@home1.opencloud.co.nz</identity>
                        <group-type>single-user</group-type>
                        <membership>permanent</membership>
                        <members>
                            <member active="true">sip:bob@home1.opencloud.co.nz</member>
                            <member active="true">sip:bobmobile@home1.opencloud.co.nz</member>
                            <member active="true">sip:bobdesk@home1.opencloud.co.nz</member>
                        </members>
                    </operator-flexible-alerting-group>
                </complete-flexible-alerting>
            </MMTelServices>
        </ServiceData>
    </RepositoryData>
</Sh-Data>

=== multiple-users group type