Question: During an IP Multimedia Session release, what action is taken regarding the IP-CAN bearer(s) used for the session if the UE cannot perform the release itself?
Option 1: The PCRF/PCF instructs the PCEF to deactivate the IP-CAN bearer, which then notifies the UE to release resources.
Option 2: The IP-CAN automatically deactivates all active bearers associated with the UE's IMSI.
Option 3: The UE is redirected to a default bearer for further communication before the original bearer is deactivated by the IP-CAN.
Option 4: The PCEF independently decides when to release resources without receiving instructions from the PCRF/PCF.
Explanation: When a UE cannot release resources itself during an IP Multimedia Session termination, the PCRF/PCF instructs the PCEF to ensure efficient resource management. The PCRF/PCF indicates to the PCEF that previously authorized resources are to be released, leading to the deactivation of the relevant IP-CAN bearer(s) by the IP-CAN, as directly instructed through this signaling flow, highlighting centralized policy control's importance in managing network resources during session termination.