Question: In an IMS centralized services scenario, when a video call terminating session uses CS media and the ICS UE is attached to an MSC Server not enhanced for ICS, which entity performs video codec negotiation for the ICS UE?
Option 1: SCC AS (Service Centralization and Continuity Application Server)
Option 2: MGCF/IMS-MGW (Media Gateway Control Function / IMS Media Gateway)
Option 3: S-CSCF (Serving Call Session Control Function)
Option 4: MSC Server
Explanation: According to IMS service control for ICS scenarios, when the ICS UE is attached to an MSC Server not enhanced for ICS, the MGCF/IMS-MGW performs video codec negotiation for the ICS UE and sets up the video media bearer, acting as a translator between the CS domain and the IMS, facilitating interoperability and managing media bearers.