Question: In a 3GPP network, where is the interception of Multimedia Messaging Service (MMS) messages performed, and what is the scope of this interception point?
Option 1: At the MMSC, responsible for recovering individual MMS messages from the user PDP context IP stream.
Option 2: At the GSN, but only for mobile originating MMS messages, with the GSN responsible for extracting MMS from the IP stream.
Option 3: At the GSN, for both mobile originating and terminating MMS messages, without the GSN being responsible for recovering individual MMS messages from the user PDP context IP stream.
Option 4: At the UE, with the Lawful Interception functionality integrated into the User Equipment for MMS services.
Explanation: This is correct because interception of MMS messages is performed at the GSN (Gateway Support Node) for both originating and terminating messages. The GSN intercepts at the PDP context level, which may or may not contain MMS messages, aligning with the standardized approach to lawful interception within the 3GPP network architecture.