The MMTelBindAci feature connects the IMPU acquired from the subscriber registration to the existing ACI for the session transfer .

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

No

Both

  • MMTelOrig_SipAccess_PartyResponse

  • MMTelTerm_SipAccess_PartyResponse

Yes

Yes - subscriber data is from the HSS

Stateless

SBB Feature

Implications on Charging for Forwarded calls

Prerequisite Features

  • SubscriberDataLookupFromHssFeatureSbb

  • MMTelStodEnabled

Session Input Variables

Session State variable name Type Comments
RegistrationRecords

Complex

Registration Records contain the public IMPU

Subscriber

String

The subscriber Id

CallType

Complex

The sip call type

StodIsEnabledForUser

boolean

Is the STOD enabled ?

Statistics

MMTelBindAci 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 → MMTelBindAci
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=2.8.0].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=2.8.0].feature.MMTelBindAci"

Name 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

BoundAciToImpu

the ACI is bound to an this is incremented.

UsedLinkedAciForBinding

the triggering ACI is not used for binding, i.e the call is not MobileTerminating then the linked ACI is used.

UsedTriggeringAciForBinding

the call is a MobileTerminating call the Triggering ACI is used for binding.

Behaviour

The feature connects the IMPU acquired from the subscriber registration to the existing ACI for the session transfer. The subscriber has to be provisioned for the service, otherwise the feature won’t bind the session. The feature will only bind the session if the 200 OK from the INVITE is received.

Source

For source code information see MMTel Session Transfer Source Code

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Sentinel VoLTE Version 2.8.0