Question: When an Application Function (AF) requests a Policy and Charging Rules Function (PCRF) to report access network information without providing service information, which of the following is REQUIRED in the AA-Request command for session binding?
Option 1: Only Framed-IP-Address AVP
Option 2: Only Subscription-Id AVP
Option 3: Framed-Ipv6-Prefix AVP and Called-Station-Id AVP (either one)
Option 4: A combination of at least two from: Framed-IP-Address AVP, Framed-Ipv6-Prefix AVP, Subscription-Id AVP, Called-Station-Id AVP, and/or IP-Domain-Id AVP
Explanation: When an AF requests access network information without providing service information, it establishes an Rx session with the PCRF using an AA-Request command. For session binding in this context, the command must contain a combination of specific attributes to ensure proper identification and configuration. These can include, but are not limited to, the user's IP address (Framed-IP-Address AVP), IPv6 prefix (Framed-Ipv6-Prefix AVP), subscription identifier (Subscription-Id AVP), the identity of the station being called (Called-Station-Id AVP), and/or the domain identifier for the IP connection (IP-Domain-Id AVP). Thus, a combination of at least two of these is required for comprehensive session binding.