B.1 Originating 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

An example of an IFC when the CCBS, CCNR or CCNL services are active at the originating S-CSCF is:

– Method: INVITE.

Editor’s note: An example for Filter Criteria for unregistered user is needed for the CCNL service.