Question: In an IMS network, when a PCEF releases IP-CAN bearer(s) established based on PCRF/PCF authorization, what action may be triggered by the P-CSCF upon receiving this indication if all relevant bearers were released?
Option 1: The P-CSCF updates the UE's allowed media flows to reflect the remaining bearers.
Option 2: The PCEF re-establishes the released IP-CAN bearer(s) without new authorization.
Option 3: The P-CSCF initiates a session release towards the remote endpoint.
Option 4: The PCRF/PCF automatically authorizes new IP-CAN bearers to replace the released ones.
Explanation: When all IP-CAN bearer(s) associated with a session are released, and this is indicated to the P-CSCF, it may trigger a session release towards the remote endpoint. This is because the foundation (bearer(s)) for the ongoing session has been removed, necessitating the termination of the session. This action aligns with efficient resource management and signaling in IMS networks, ensuring that sessions without underlying connectivity are properly closed.