5.1.6 Served user identification

32.2603GPPCharging managementIP Multimedia Subsystem (IMS) chargingRelease 17Telecommunication managementTS

Subscriber Identifier is an Information Element used in both online and offline charging information to identify the served user for the specific leg of an IMS session. A list of Subscription Id(s) for IMS CDR shall contain the Public user Id(s) for the served user.

In the case when the served user is obtained from the P-Header P-Served-User (can be available in P-CSCF, S-CSCF and AS) then it shall also be used as Subscription-Id in both online and offline charging.

The Subscriber Equipment Number field contains the identification of the mobile device (e.g. IMEI) that the subscriber is using.

An Instance Id is defined as a URN generated by the device that uniquely identifies a specific device amongst all other devices (fixed or mobile). The Instance Id is transported in the sip.instance feature tag in the Contact header of a SIP request associated with the served user.