Question: In an IMS (IP Multimedia Subsystem) scenario with multiple Access Legs, where does the responsibility lie for updating/forwarding a HOLD request for one or more media components when initiated by the remote end or the UE itself?
Option 1: User Equipment (UE) updates all affected Access Legs in both scenarios.
Option 2: Service Centralization and Continuity Application Server (SCC AS) updates only its local leg, while the UE handles remote legs.
Option 3: The decision is dynamically made based on the type of media component being held.
Option 4: For UE-initiated HOLD, the UE acts on all Access Legs; for remote-end initiated HOLD, the SCC AS forwards the request to all affected Access Legs.
Explanation: This answer correctly distributes the responsibility based on the initiator of the HOLD service. When the User Equipment (UE) initiates the HOLD, it is responsible for invoking the HOLD procedures on all its Access Legs containing the affected media components. Conversely, if the remote end initiates the HOLD, the Service Centralization and Continuity Application Server (SCC AS) takes on the role of forwarding this request to all relevant Access Legs, ensuring seamless service continuity across different access networks.