Question: When installing or modifying IP flow mobility routing rules at IP-CAN session modification, what additional AVP must the PCEF include in the CC-Request for the new or updated rules?
Option 1: Routing-Rule-Remove AVP with the Routing-Rule-Identifier
Option 2: Event-Trigger AVP set to SESSION_MODIFICATION
Option 3: Routing-Filter AVP with wildcarded filters only
Option 4: Routing-Rule-Install AVP with one or more Routing-Rule-Definition AVPs
Explanation: When the PCEF installs, modifies, or removes IP flow mobility routing rules at IP-CAN session modification for new or updated rules, it must include the Routing-Rule-Install AVP along with one or more Routing-Rule-Definition AVPs in the CC-Request. This ensures the PCRF receives necessary information to correctly install or modify the IP flow mobility routing rules, distinguishing from removal procedures, other triggers, and specifying more than just filter settings.