Question: In an IP Multimedia Subsystem (IMS), when a User Equipment (UE) initiates a session redirection, what is the typical outcome if the UE does not subscribe to the session redirection service or fails to provide a new destination Uniform Resource Identifier (URI)?
Option 1: The session setup attempt is automatically completed with the original destination URI.
Option 2: The Serving CSCF (S-CSCF) may supply a new destination URI or terminate the session setup attempt with a failure response.
Option 3: The Proxy CSCF (P-CSCF) caches the INVITE request for later processing.
Option 4: The Home Subscriber Server (HSS) is queried again for an alternative destination.
Explanation: In the context of IMS session management, when a UE initiates a redirection but lacks subscription to this service or omits providing a new URI, the S-CSCF has the capability to either provide an alternative URI based on its service logic or end the setup process with an error message. This ensures flexibility in handling such scenarios while maintaining network efficiency and user experience.