Question: What action must a User Equipment (UE) take when explicitly deactivating the IP-CAN bearer used for IMS signaling while an IMS session is in progress?
Option 1: De-register from the IMS and then release the session
Option 2: Release the IMS session and then de-register from the IMS before deactivating the IP-CAN bearer
Option 3: Temporarily suspend the IMS session to deactivate the IP-CAN bearer, then resume the session
Option 4: Immediately deactivate the IP-CAN bearer, relying on the network to handle the active IMS session
Explanation: Deactivating the bearer used for signaling while a session is in progress requires careful handling to maintain service continuity and integrity. Releasing the IMS session first ensures that resources are properly cleared, and then de-registering from the IMS updates the UE's status accurately before the bearer is deactivated, preventing potential disruptions or misrouted traffic. This sequence aligns with maintaining a stable and managed network state during dynamic changes initiated by the UE.