Content for  TS 23.278  Word version:  17.0.0

During the UE registration, the HSS shall send the filter criteria for the IM-SSF to the S-CSCF if the subscriber is provisioned with IP Multimedia CAMEL Subscription Information data at the HSS.

• The HSS shall include the IMSI data for the subscriber within the Service Information element of the filter criteria for IM-SSF. The IMSI shall be used for querying the HSS for CAMEL Subscription Information data via a MAP interface.

The CAMEL service provider determines the actual format of the data sent within the Service Information element of the filter criteria (e.g. IMSI). The actual format is transparent to the S-CSCF i.e. CAMEL service information is not processed, analysed, or evaluated by the S-CSCF. It is, however, known to the IM-SSF, gsmSCF, and the HSS (for provisioning of the service information data). If a registration/de-registration request matches the filter criteria of the IM-SSF, the S-CSCF informs the IM-SSF of the request by performing a third party registration/de-registration i.e. a SIP REGISTER message is sent from the S-CSCF to the IM-SSF. General handling of IP Multimedia registration, re-registration, de-registration and receipt of initial filter criteria at the S-CSCF is specified in TS 23.228 and TS 23.218. The process and the procedures specific to CAMEL are specified in this clause:

• Process Register_IM_SSF;
• Procedure CAMEL_IMCN_Register;
• Procedure CAMEL_IMCN_DeRegister.