Question: At what point is the 'Answered UE originating CS multimedia calls' measurement triggered in a telecom network?
Option 1: On reception of a 'CONNECT ACKNOWLEDGE' message for the multimedia service from the MSC-S to the Calling Party.
Option 2: On transmission of a 'SETUP' message for the multimedia service from the UE to the MSC-S.
Option 3: When the UE initiates a call attempt and sends an 'ALERTING' message.
Option 4: Upon successful call termination, indicated by a 'RELEASE COMPLETE' message.
Explanation: This question tests understanding of call setup procedures in circuit-switched (CS) multimedia services. The correct answer is the trigger point for counting an answered UE-originated CS multimedia call, confirming the call's successful establishment and acceptance by the called party, highlighting signaling messages' importance in managing telecom network performance metrics.