European Telecommunications Standards Institute

Digital cellular telecommunications system (Phase 2+) (GSM); Includes Diskette
 N TS 124 229

Annotation

The present document defines a call control protocol for use in the IP Multimedia (IM) Core Network (CN) subsystem based on the Session Initiation Protocol (SIP), and the associated Session Description Protocol (SDP).

The present document is applicable to:

- the interface between the User Equipment (UE) and the Call Session Control Function (CSCF);

- the interface between the CSCF and any other CSCF;

- the interface between the CSCF and an Application Server (AS);

- the interface between the CSCF and an ISC gateway function;

- the interface between the ISC gateway function and an Application Server (AS);

- the interface between the CSCF and the Media Gateway Control Function (MGCF);

- the interface between the S-CSCF and the Multimedia Resource Function Controller (MRFC);

- the interface between the Application Server (AS) and the Multimedia Resource Function Controller (MRFC);

- the interface between the S-CSCF and the Media Resource Broker (MRB);

- the interface between the AS and the MRB;

- the interface between the MRB and the MRFC;

- the interface between the CSCF and the Breakout Gateway Control Function (BGCF);