This feature sets the companion device headers to the initial INVITE when the subscriber has been provisioned with companion devices.

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

Terminating

SipAccessSubscriberCheck-SysPost-MMTel

No

Yes

Stateless

POJO

Prerequisite Features

Feature Configuration

There is no feature configuration for this feature.

Session Input Variables

Session State variable name Type Comments 
CallType

Complex

The calltype

 
MetaswitchCompanionDevice

Complex

The companion device data that is provisioned in HSS

Statistics

Feature 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 → SetCompanionDeviceHeaders
or with rhino-stats:
"SLEE-Usage.Services.ServiceID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.0.0].SbbID[name=sentinel.volte.sip,vendor=OpenCloud,version=4.0.0].feature.SetCompanionDeviceHeaders"

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 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

 
 processingSipRequest

the sip request is processed to determine if adding X-Msw-Companion-Device header

 
 companionDeviceHeaderAdded

the companion device header X-Msw-Companion-Device has been added

 
 companionDeviceHeaderExists

the companion device header X-Msw-Companion-Device already exists in the sip request

 
 companionDeviceHeaderFailed

fail to add companion device header

 
 companionDeviceHeaderNotAuthorized

companion device provisioned is not operator authorized

 
 companionDeviceHeaderRetarget

companion device header will not be added when the sip request is retargeted

Behaviour

  • If the call type is not mobile terminating then the feature finishes with no further processing.

  • The feature increases relevant stats and finishes without adding the companion device header, if one of the following situations happens:

    • oc-retarget header is found in the sip request;

    • the companion header X-Msw-Companion-Device already exists;

    • the companion device data is not operator authorized.

  • When it needs to add the companion device header, the feature goes through all the companion devices provisioned and adds the information as X-Msw-Companion-Device headers to the sip request. See the header format in X-Msw-Companion-Device Header.

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Sentinel VoLTE Version 4.0.0