Question: In a 3GPP network with Wireless Local Area Network (WLAN) interworking for I-WLAN, where is Lawful Interception (LI) performed in the Visited Public Land Mobile Network (VPLMN) according to LI requirements for the Packet Data Gateway (PDG)?
Option 1: At the PDN-GW (Packet Data Network Gateway)
Option 2: At the ePDG (evolved Packet Data Gateway)
Option 3: At the WLAN UE (Wireless Local Area Network User Equipment)
Option 4: At the DSMIPv6 (Dual-Stack Mobile IPv6) Server
Explanation: This is correct because, in the context of 3GPP security and lawful interception architecture for I-WLAN scenarios within a VPLMN, the ePDG is designated as the point where Lawful Interception (LI) should be performed to meet LI requirements for the PDG, effectively managing packet data intercepts at this gateway.