4.1 Relationship to CS domain and the IP-Connectivity Access Network

23.2283GPPIP Multimedia Subsystem (IMS)Release 18Stage 2TS

The IP multimedia subsystem utilizes the IP‑CAN to transport multimedia signalling and bearer traffic. IP‑CANs that maintain the service while the terminal moves, hide these moves from the IP multimedia subsystem.

The IP multimedia subsystem is independent of the CS domain although some network elements may be common with the CS domain. This means that it is not necessary to deploy a CS domain in order to support an IP multimedia subsystem based network.