This feature fetches the Correlation MSISDN from the HSS, using the Sh Cache Microservice. It can be invoked during Third Party Registration and INVITE session processing.

Prerequisite features

SCC Decode Companion Device Info Feature if companion device CRSNs are to be derived.

Description

This feature fetches the Correlation MSISDN from the HSS, using the Sh Cache Microservice. It can be invoked during Third Party Registration and INVITE session processing. In addition, it tries to derive a CSRN from the CMSISDN.

The feature issues a query to the Sh Cache Microservice for the Correlation MSISDN, unless a value is already set in session state. When building the request to the HSS, it uses a User Data Request with Sh Data Reference 17 - MSISDN or MSISDN + ExtendedMSISDN. The query access key is the default Public Identity, or the default Public Identity plus the IMS Private Identity. The access chosen is based on the feature configuration attribute "UDRIncludedIdentities".

The Sh Cache Microservice may return either a failure response, or an Sh document.

If the feature is configured to look for the Correlation MSISDN in MSISDN, it uses the first MSISDN in the returned set at Sh-Data/PublicIdentifiers/MSISDN in the Sh UDA response.

If the feature is configured to look for the Correlation MSISDN in Extended-MSISDNs, it uses the first MSISDN in the returned Extended MSISDNs set at Sh-Data/PublicIdentifiers/Extension/Extension/Extension/ExtendedMSISDN in the Sh UDA response.

If the feature is able to find an MSISDN in the returned set, it increments the SuccessfullyRetrievedCMSISDN counter, and modifies the output session state variables.

If the returned set is empty, the feature increments the FailedToRetrieveCMSISDN counter, and does not modify any output session state variables.

If the Sh Cache Microservice returns a failure response, the feature increments the ShCacheError counter, and does not modify any output session state variables.

When the session state field UseHLRBasedCSRN is false

  • the feature derives a CSRN by prefixing the MSISDN with the configured prefix. If a CMSISDN could not be found, and EnableCSRoutingFromRequestUri is enabled, the feature attempts to extract a phone number from the Request-URI, and sets the CSRN in session state as this phone number prefixed with the configured prefix.

  • if session state has companion devices, the feature sets CompanionDeviceCSRNs and HasCompanionDeviceCSRNs by prefixing the MSISDNs in CompanionDevices session state field with the configured prefix.

Session input variables

Variable name Type Comments
PublicIds

String array

The IMS Public Ids for the Served User, used when triggered on a REGISTER

PrivateId

String

Contains the subscriber’s private identity, used when triggered on a REGISTER

RegistrationRecords

List<RegistrationRecord>

The registration records for the Served User, used when triggered on an INVITE

CompanionDevices

List<CompanionDevice>

The list of companion devices decoded from the X-Msw-Companion-Device header

UseHLRBasedCSRN

boolean

When true CSRNs are not derived.

Session output variables

Variable name Type Comments
CMSISDN

String

Set to the Correlation MSISDN if the feature could retrieve it

HasCMSISDN

boolean

Set to true if the feature could retrieve the CMSISDN

CSRN

String

The CSRN of the served user, if the feature could derive it.

HasCSRN

boolean

Indicating whether the CSRN session state field has been populated.

CompanionDeviceCSRNs

List<String>

The CSRNs of the companion devices

HasCompanionDeviceCSRNs

boolean

indicating whether the CompanionDeviceCSRNs session state field has been populated

Statistics

There are two sets of statistics, one as the feature is invoked during Registration, and another during INVITE processing.

Both sets of statistics share the same interface. They are located in different SLEE services.

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

FailedToRetrieveCMSISDN

Counter

Incremented when the ShCM query returns a document that does not contain the CMSISDN in the expected location.

SuccessfullyRetrievedCMSISDN

Counter

Incremented when the ShCM query returns a document that does contain a CMSISDN in the expected location.

ShCacheError

Counter

Incremented when the ShCM query returns a non-success response code.

InvalidConfig

Counter

Incremented when unsupported CMSISDN source is configured.

CSRNNotDetermined

Counter

Incremented when the CSRN could not be determined

CSRNDetermined

Counter

Incremented when the CSRN could be determined

CompanionDeviceCSRNsDetermined

Counter

Incremented when the CompanionDeviceCSRNs session state field is set

ResponseLatency

Sampled

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

Statistics as part of Registration

These statistics are tracked by the sentinel.registrar SBB and can be found using the parameter set SLEE-Usage.Services.ServiceID[name=sentinel.registrar,vendor=OpenCloud,version=3.1.0].SbbID[name=sentinel.registrar,vendor=OpenCloud,version=3.1.0].feature.FetchCMSISDN

Or in REM under the following parameter set:
SLEE-Usage → sentinel.registrar service → sentinel.registrar SBB → feature → FetchCMSISDN

Statistics as part of INVITE processing

These statistics are tracked by the sentinel.volte.sip SBB and can be found using the parameter set SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=3.1.0].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=3.1.0].feature.FetchCMSISDN

Or in REM under the following parameter set:
SLEE-Usage → sentinel.volte.sip service → sentinel.volte.sip SBB → feature → FetchCMSISDN

Configuration

The configuration is scoped according to the Sentinel Selection key, and is stored in the FetchCMSISDNFeatureConfigProfileTable profile.

There are four configuration attributes, as follows:

Attribute name Type Valid values
CMSISDNSource

String

MSISDN, or EXTENDED_MSISDN

UDRIncludedIdentities

String

IMPU , or IMPU_AND_IMPI

CSRNPrefix

String

EnableCSRoutingFromRequestURI

boolean

Note: If the CMSISDN source is set to EXTENDED_MSISDN then the UDRIncludedIdentities must be set to IMPU_AND_IMPI.

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Sentinel VoLTE Version 3.1.0