What is TIP?

From 3GPP TS 24.608:

The Terminating Identification Presentation (TIP) service provides the originating party with the possibility of receiving identity information in order to identify the terminating party.

The network shall deliver the Terminating Identity to the originating party on communication acceptance regardless of the terminal capability to handle the information.

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

Originating

SipAccess_SubscriberCheck, and SipAccess_PartyResponse

No

Yes

Stateless — the feature is stateless, even though it is to be invoked at multiple feature execution points

POJO

Prerequisite features

These features must run before TIP:

Source Code

This feature’s source code is available in the Sentinel VoLTE SDK in the mmtel-id-presentation-restriction module pack. It can be viewed by using the create-module command in the SDK with that module pack, for example:

> create-module new-idpr-module opencloud#mmtel-id-presentation-restriction#volte/2.9.0;2.9.0.0

This command will prompt you for information needed to create the new modules, once completed the original source for the feature can be found in the new modules.

The module-pack includes the following modules relevant to this feature:

Module Name Description

mmtel-id-presentation-restriction

Group module for the feature that includes all of the modules listed below.

mmtel-id-presentation-restriction-library

Contains code shared by all ID presentation and restriction features.

mmtel-tip-profile

Contains the profile specification for the feature configuration profile table.

mmtel-tip

Contains the feature itself.

Network operator data

There is no network operator data.

Session input variables

TIP requires the following session state input variables:

Variable name Type Comments 
MMTelTIPServiceData

Complex

 
APartyFromHeaderAnonymized

boolean

Used to determine whether the "from-change" tag needs to be removed from outgoing responses.

Session output variables

Variable name Type Comments 
RanTip

boolean

Signals to other features that TIP ran on this session.

Statistics

MMTelTIP 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 → MMTelTIP
or with rhino-stats:
SLEE-Usage → [sentinel.volte.sip service name] → [sentinel.volte.sip SBB name] → .feature.MMTelTIP

Statistic Incremented when…​ 
Started

the feature runs

 
FailedToStart

Sentinel VoLTE encounters an error while attempting to start the feature

 
IssuedWarning

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

 
FailedDuringExecution

a fatal problem is encountered and the feature cannot execute correctly

 
TimedOut

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

 
ProcessingResponse

the feature processes a SIP response

 
ProcessingRequest

the feature processes a SIP request

 
OverrideCategoryTriggered

the feature disregards requested privacy settings on an incoming SIP message (due to the subscriber having override category status)

 
FromChangeTagRemoved

the feature removes the from-change tag from a Supported header in the outgoing SIP message

 
PrivacyHeaderChanged

the feature changes the contents of the Privacy header on an outgoing SIP message

Behaviour

TIP may modify the INVITE traversing through from A to B, and may modify responses from B to A.

MMTel TIP is treated as active when MMTelTIPServiceData.OperatorAuthorized and MMTelTIPServiceData.Active are true.

MMTel TIP is treated as not active when MMTelTIPServiceData.OperatorAuthorized or MMTelTIPServiceData.Active is false

Header manipulation behaviour

SIP Operation TIPActive Originating User TIP Override Category Action(s)

INVITE

No

N/A

  • Remove option tag from-change from INVITE (if present).

INVITE

Yes

N/A

  • Forward INVITE as is.

Response from B party

Yes/No

Yes

  • Remove Privacy header (if present)

  • remove "from-change" tag if From header was anonymised by OIR/OIP.

Response from B party

No

No

  • Remove P-Asserted-Identity header

  • Remove Privacy headers (if present)

  • Remove "from-change" tag if From header was anonymised by OIR/OIP.

Response from B party

Yes

No

  • Remove "from-change" tag if From header was anonymised by OIR/OIP.

Graceful handling of terminating access

TIP is an originating feature. It will finish execution without modifying any state if it is invoked in a terminating attempt.

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Sentinel VoLTE Version 2.9.0