Question: In IMS (IP Multimedia Subsystem) for lawful interception (LI), what is the primary purpose of the CSCF (Call/Session Control Function) accessing Instance IDs for all active registrations?
Option 1: To extract and provide the IMEI to DF2 (Delivery Function 2) for targeted interceptions, supporting IMEI-based LI as mandated by national regulations.
Option 2: To manage resource allocation efficiently across all registered User Equipment (UEs) on the network.
Option 3: To enforce Quality of Service (QoS) policies based on subscriber profiles stored against Instance IDs.
Option 4: To monitor and analyze network traffic patterns for operational optimization.
Explanation: The correct answer highlights the crucial role of CSCF in lawful interception within IMS. By accessing Instance IDs, the CSCF can extract IMEIs when required for a specific target interception and provide them to DF2, thereby supporting IMEI-based lawful interception as mandated by national regulations.