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:

Source Code

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

> create-module new-imsid-module opencloud#volte-imsid-lookup#volte/3.1.0;3.1.0.0

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 a single module:

Module Name Description

volte-imsid-lookup

Contains the feature’s code.

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.

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Sentinel VoLTE Version 3.1.0