Question: What action does the Mobility Management Entity (MME) take when it receives an `EXTENDED SERVICE REQUEST` message from a User Equipment (UE) with Service type set to "mobile terminating CS fallback or 1xCS fallback" and CSFB response set to "CS fallback accepted by the UE", if the Call Cancelled Flag is already set to "true"?
Option 1: The MME sets the Call Cancelled Flag to "true" again and accepts the CS fallback call.
Option 2: The MME ignores the message and keeps the Call Cancelled Flag as "true".
Option 3: The MME sends a new SGsAP-PAGING-REQUEST message to the VLR.
Option 4: The MME sets the Call Cancelled Flag to "false" and rejects the CS fallback call.
Explanation: According to the specified procedure, when the MME receives an `EXTENDED SERVICE REQUEST` with the mentioned conditions and the Call Cancelled Flag is set to "true", it resets the flag to "false" but also rejects the CS fallback call. This ensures that if a service abort was previously requested (setting the flag to "true"), upon a new, specific service request from the UE, the MME re-evaluates the situation, updates the flag status, and takes appropriate action regarding the CS fallback call, which in this case is rejection.