Question: In a Gx interface, when sending an INITIAL-REQUEST CCR with CC-Request-Type, what is the requirement for the TDF-Information AVP (AVP code 1087) sent from the PCEF to the PCRF regarding its included attributes?
Option 1: It must include both TDF-Destination-Realm and TDF-IP-Address AVPs.
Option 2: It shall include either the TDF-Destination-Realm and TDF-Destination-Host AVP, or the TDF-IP-Address AVP.
Option 3: It can only include the TDF-Destination-Host AVP without any other TDF-related AVPs.
Option 4: The inclusion of any TDF-related AVPs is optional for INITIAL-REQUEST.
Explanation: This question tests understanding of specific attribute requirements within the TDF-Information AVP in initial request scenarios. Option 2 is correct because, according to the specification, the TDF-Information AVP must contain either the combination of TDF-Destination-Realm and TDF-Destination-Host AVPs or the singular TDF-IP-Address AVP when sent in an INITIAL-REQUEST CCR. This ensures proper routing and handling of application detection and reporting for the IP-CAN Session by the designated TDF.