Question: In an IMS Service Continuity scenario, when performing a CS to PS access transfer, which entity initiates the establishment of a new Access Leg towards the ATCF (Access Transfer Control Function)?
Option 1: MSC Server
Option 2: SCC AS (Service Centralization and Continuity Application Server)
Option 3: UE (User Equipment)
Option 4: Transferring-out Access Network
Explanation: During a CS to PS access transfer, the direction of the transfer implies that the User Equipment (UE) is moving from a Circuit Switched (CS) domain to a Packet Switched (PS) domain. Given this context, the UE must initiate the establishment of a new Access Leg towards the ATCF to facilitate the transfer, as it is the entity directly involved in the change of access type. This highlights the UE's role in managing its connectivity in telecom networks, especially during access technology transitions.