Question: In a scenario where P-CSCF Restoration Enhancement is supported, what information must the P-CSCF include in the AAR command if the UE's IP address is not unique and the IP-Domain-ID is also not available?
Option 1: Only the IMSI in the Subscription-Id AVP
Option 2: Only the APN in the Called-Station-Id AVP
Option 3: Both the IMSI in the Subscription-Id AVP and the APN in the Called-Station-Id AVP
Option 4: The UE's non-unique IP address in the Framed-IP-Address AVP alone
Explanation: According to the specified procedure for handling non-unique IP addresses without an available IP-Domain-ID, the P-CSCF must provide additional identifiers. Including both the IMSI in the Subscription-Id AVP and the APN in the Called-Station-Id AVP ensures the PCRF can accurately identify and manage the session for P-CSCF Restoration, given the absence of a unique IP address or IP-Domain-ID.