Question: In IMS Service Continuity, what role does the Service Centralization and Continuity Application Server (SCC AS) assume in the signalling path to facilitate Session Transfer?
Option 1: SCC AS acts as a User Agent (UA) to directly manage bearer paths.
Option 2: SCC AS behaves as a SIP Application Server (SIP-AS) to set up a Third-Party Call Control (3pcc) for managing the bearer path.
Option 3: SCC AS functions solely as a Proxy Server, redirecting signalling without interfering with bearer setup.
Option 4: SCC AS operates as a Media Gateway, directly controlling media streams for seamless transfer.
Explanation: The correct answer is Option 2 because, to enable and execute Session Transfer smoothly in IMS Service Continuity, the SCC AS needs to control the bearer path effectively. By behaving as a SIP Application Server (SIP-AS) and setting up a Third-Party Call Control (3pcc), the SCC AS can efficiently manage the session’s bearer path, ensuring continuity during transfers. This approach aligns with the principles of IMS service continuity, where signalling and bearer paths are meticulously managed to prevent service interruptions.