B.1 Scope

24.2293GPPIP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP)Release 18Stage 3TS

The present annex defines IP-CAN specific requirements for 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), where the IP-CAN is General Packet Radio Service (GPRS). The GPRS IP-CAN has a core network:

– with SGSN connected to GGSN providing a UE with a PDP context for the IM CN subsystem-related signalling and media; or

– with SGSN connected to S-GW and S-GW connected to P-GW providing the UE with a PDP context for the IM CN subsystem-related signalling and media.

NOTE: The UE is unaware of how the network provides the UE with a PDP context for the IM CN subsystem-related signalling and media.

The core network can be supported by GERAN and UTRAN radio access networks.

The present annex also defines procedures for invoking CS domain services.