Question: In an IMS network with multiple Access Legs, when a UE receives a request on one Access Leg for a CONF service to replace an existing session within the same dialog, what action should the UE take?
Option 1: Ignore the request if it's not received on the primary Access Leg.
Option 2: Follow established procedures to establish a new session with the conference focus.
Option 3: Automatically reject the request due to multiple Access Legs.
Option 4: Send a response requesting the remote end to use a single Access Leg.
Explanation: When handling Conference (CONF) services with multiple Access Legs, especially when receiving requests to replace existing sessions within the same dialog, the UE must adhere to standardized procedures for seamless service continuity. Following established procedures ensures the UE correctly establishes a new session with the conference focus, maintaining the integrity of the IMS service across multiple access points, aligning with Service Continuity principles in IMS for uninterrupted user experience.