B.2 Terminating side

24.6423GPPCompletion of Communications to Busy Subscriber (CCBS) and Completion of Communications by No Reply (CCNR) using IP Multimedia (IM) Core Network (CN) subsystemProtocol specificationRelease 16TS

Examples of the IFC at the terminating S-CSCF when the user is not registered and CCNL is supported are:

– Method: INVITE.

– Method: SUBSCRIBE.

Examples of the IFC at the terminating S-CSCF when the user is registered and CCNL is supported are:

– Method REGISTER.

Examples of the IFC at the terminating S-CSCF when the user is registered and CCBS or CCNR or both are supported are:

– Method: INVITE.

– Method: SUBSCRIBE.

Annex C (informative):
IANA Registration templates