Question: For non-ICS (IP Communication Services) User Equipment (UE) establishing IMS (IP Multimedia Subsystem) sessions, what is the primary function of the MSC Server enhanced for ICS regarding communication with the IMS?
Option 1: To perform interworking between the I2 reference point and CS (Circuit Switched) signalling for IMS Multimedia Telephony Service.
Option 2: To manage media transfer protocols for efficient data exchange.
Option 3: To handle subscriber authentication and authorization processes.
Option 4: To optimize network resources for IMS session setups.
Explanation: The correct answer is Option 1 because, in the context of IMS centralized services, when non-ICS UEs establish IMS sessions via an MSC Server enhanced for ICS, this server must facilitate communication between the IMS's service control signalling and traditional CS signalling. This interworking is crucial for delivering the IMS Multimedia Telephony Service, ensuring seamless integration of IP-based services with legacy circuit-switched infrastructure.