Question: How does the Lawful Interception Management System Function (LMISF) correlate media packets with a specific IMS session for interception purposes?
Option 1: By comparing IP addresses and UDP port numbers exchanged in the SDP offer and answer process with those of the media packets.
Option 2: Through direct examination of GTP-U layer information provided by S-GW/BBIFF for both Signalling and Media Bearers.
Option 3: Based solely on Call Identity values extracted from SIP messages without considering media packet details.
Option 4: By utilizing IMSI numbers directly associated with each media packet, as provided by the UE.
Explanation: The correct method for correlating media packets with a specific IMS session involves analyzing the IP addresses and UDP port numbers. These are exchanged during the SDP offer and answer process within SIP messages and then compared with the same information in the media packets. This comparison enables the LMISF to accurately associate media packets with their corresponding IMS sessions, facilitating lawful interception.