Question: Who among the following is NOT authorized to terminate an ongoing Voice Group Call Service (VGCS) as per standard telecom protocols?
Option 1: Calling Service Subscriber with uplink access
Option 2: Entitled Dispatcher using network-defined user operation
Option 3: Any User Equipment (UE) participating in the group call without specific entitlement
Option 4: Calling Dispatcher responsible for initiating the group call
Explanation: According to standard telecom protocols for Voice Group Call Service, only specific entities are authorized to terminate an ongoing call. These include the calling service subscriber (if they have uplink access), a calling dispatcher, or an entitled dispatcher using predefined methods. Any User Equipment (UE) participating in the group call without specific entitlement does not have the authorization to terminate the call, ensuring the service's integrity and control.