Question: In a Gx session established for IMS Emergency services, how does the PCRF determine to provision PCC Rules restricting access to Emergency Services?
Option 1: Receiving a CCR command with a CC-Request-Type AVP set to "UPDATE_REQUEST" and a specific APN in the Access Network Information AVP.
Option 2: Detecting an IMS Emergency service PDN identifier in the Called-Station-Id AVP of a CCR command with a CC-Request-Type AVP set to "INITIAL_REQUEST".
Option 3: Upon interaction with the SPR to obtain authorized QoS for the default EPS bearer, which indicates an emergency session.
Option 4: Receiving a specific Priority-Level AVP value in the CCR command that is reserved for operator domain use of IMS Emergency sessions.
Explanation: The PCRF identifies IMS Emergency services by detecting a matching PDN identifier for Emergency APNs in the Called-Station-Id AVP during an INITIAL_REQUEST. This triggers provisioning of PCC Rules with priority handling as per operator policies, ensuring seamless emergency communications.