Question: In a Collaborative Session established concurrently with a terminating IMS session setup, who determines the Customized Alerting Tones (CAT) provided to the remote party?
Option 1: The remote party's User Equipment (UE)
Option 2: The network, under control of the Serving and Streaming Function (SSF)
Option 3: The Application Server (AS) associated with the remote party's UE
Option 4: The network, under the control of the Service Centralization and Continuity (SCC) Application Server (AS) associated with the Controller UE
Explanation: In Collaborative Sessions set up concurrently with a terminating IMS session, the Customized Alerting Tones (CAT) for the remote party are determined by the network, controlled by the Service Centralization and Continuity (SCC) Application Server (AS) associated with the Controller UE, ensuring consistency in service experience.