Question: In a 3GPP Lawful Interception architecture, which of the following events applicable to the PDN-GW (Packet Data Network Gateway) triggers the transmission of information to the Delivery Function 2 (DF2) without necessarily involving a change in the PMIP (Proxy Mobile Internet Protocol) tunnel state?
Option 1: PMIP Attach/tunnel activation
Option 2: Packet Data Header Information
Option 3: Start of interception with active PMIP tunnel
Option 4: PMIP session modification
Explanation: The correct answer is "Start of interception with active PMIP tunnel" because this event specifically involves the initiation of interception activities while the PMIP tunnel is already in an active state, implying no change in the tunnel’s activation status (e.g., no attach, detach, or modification of the PMIP session) is required to trigger the information transmission to DF2. This highlights a nuanced understanding of lawful interception triggers within the context of 3GPP network procedures and PMIP management.