Question: In a 3GPP network, for case 2a and case 2b scenarios involving an ePDG (Evolved Packet Data Gateway), what specific information does the BBERF (Bearer Binding and Event Reporting Function) in the ePDG support reporting to the PCRF (Policy and Charging Rules Function)?
Option 1: Only the UE's (User Equipment) Global IP address
Option 2: The UE's Local IP address and UDP port number
Option 3: Bearer binding details along with downlink bearer setup
Option 4: Uplink bearer verification results and ePDG's public IP
Explanation: According to the specified behavior for case 2a and case 2b scenarios, when involving an ePDG, the BBERF is limited in its functionality. Specifically, it only supports reporting the UE's Local IP address and the associated UDP port number to the PCRF, excluding more comprehensive bearer management functions. This selective reporting aligns with the network's need for specific, relevant information to manage policies and charging effectively, without necessitating the full spectrum of bearer binding and verification functionalities in these particular scenarios.