Question: What is the primary purpose of the INITIAL_REQUEST value (0) for the Rx-Request-Type AVP in the context of Policy and Charging Control over the Rx reference point?
Option 1: To update an existing Rx session with new policy rules.
Option 2: To restore a P-CSCF due to a previous failure or shutdown.
Option 3: To initiate an Rx session, providing initial relevant information.
Option 4: To terminate an ongoing Rx session due to inactivity.
Explanation: In the context of Policy and Charging Control, accurately identifying the reason for sending an AA-Request message (via the Rx-Request-Type AVP) is crucial for proper session management. The INITIAL_REQUEST value signifies the beginning of a new session, ensuring that all necessary initial information is exchanged. This distinction is vital for network efficiency and effective policy enforcement.