Question: In an IMS-based RLOS (Registered Location of Originating Subscriber) Session Initiation, what is the expected action by the P-CSCF upon receiving an originating session request without an RLOS indication from the UE?
Option 1: The P-CSCF will forward the request to the S-CSCF for further processing.
Option 2: The P-CSCF will send a notification to the UE requesting the RLOS indication.
Option 3: The P-CSCF shall reject the originating session.
Option 4: The P-CSCF will bypass the RLOS check based on operator policy.
Explanation: According to IMS-based RLOS Session Initiation requirements, if an originating session from a UE does not include an RLOS indication, the P-CSCF is mandated to reject such a session. This ensures compliance with registered location of origin policies and prevents unauthorized or unverified sessions from proceeding.