Question: In IMS Service Continuity, when is the Session Release procedure initiated for a non-emergency session's Source Access Leg Release?
Option 1: Immediately after receiving the switch command to the Target Access Leg
Option 2: Before initiating the session modification procedures for access leg switching
Option 3: After the switch to the Target Access Leg is complete, as part of the AS/UE session release procedures
Option 4: Simultaneously with the initiation of the Target Access Leg setup
Explanation: For non-emergency sessions, the correct timing for initiating the Session Release procedure for the Source Access Leg is after the switch to the Target Access Leg is complete. This ensures a seamless handover and prevents premature release of the source leg before the target leg is fully established, as per standard AS/UE session release procedures in IMS contexts.