Question: In an IMS (IP Multimedia Subsystem) environment, how can Communication Deflection service be centrally executed for a call delivered to a non-ICS (IMS Centralized Services) UE using CS (Circuit Switched) call control, assuming network and user support?
Option 1: Via direct interaction between the CS domain and the IMS Application Server (AS)
Option 2: Through utilization of SIP (Session Initiation Protocol) signaling directly to the non-ICS UE
Option 3: By leveraging Intelligent Network (IN) capabilities, such as O-CSI CAMEL (Customized Applications for Mobile networks Enhanced Logic)
Option 4: Via SMS (Short Message Service) based triggering from the IMS to the CS domain
Explanation: This is correct because when a call is delivered using CS call control to a non-ICS UE, leveraging Intelligent Network (IN) capabilities like O-CSI CAMEL allows for centralized execution of Communication Deflection in the IMS. This approach enables service logic to reside in the network, facilitating deflection without requiring direct SIP interaction with the non-ICS UE or other impractical direct interactions.