Question: In a Policy and Charging Control (PCC) architecture, what is the requirement when both IPv4 and IPv6 addresses are available for the Access Node Gateway (e.g., SGW for 3GPP or AGW/ePDG for non-3GPP networks) in Diameter commands?
Option 1: A single instance of the AN-GW-Address AVP can accommodate both IPv4 and IPv6 addresses.
Option 2: The selection of either IPv4 or IPv6 address is sufficient; providing both is optional but can be done in one AVP instance.
Option 3: Two separate instances of the AN-GW-Address AVP are required to provide both IPv4 and IPv6 addresses.
Option 4: The AN-GW-Address AVP only supports IPv6 for non-3GPP networks, thus only one instance is needed for IPv6.
Explanation: In PCC, when both IPv4 and IPv6 addresses are available for the Access Node Gateway (such as SGW in 3GPP or AGW/ePDG in non-3GPP networks), to accurately convey this information in Diameter commands, two instances of the AN-GW-Address AVP are necessary. This ensures that each address type is properly represented, facilitating correct routing and communication setup in heterogeneous network environments.