Question: In an IMS (IP Multimedia Subsystem) environment, when an MSC (Mobile Switching Center) Server enhanced for ICS (IMS Centralized Services) receives a session release from which entity, does it subsequently release the CS (Circuit Switched) session with the non-ICS UE?
Option 1: Receiving a session release from the SCC AS (Service Centralization and Continuity Application Server)
Option 2: Receiving a session release from the IMS (IP Multimedia Subsystem)
Option 3: Receiving a session update from the HSS (Home Subscriber Server)
Option 4: Receiving a media transfer request from the non-ICS UE
Explanation: According to the described behavior, when the MSC Server enhanced for ICS receives a session release directly from the IMS, it initiates the release of the CS session with the non-ICS UE. This is a critical step in managing sessions across different network domains (IMS and CS) to ensure seamless service termination. The correct answer highlights the direct trigger for releasing the CS session based on IMS signaling.