Question: What is the primary purpose of measuring the Mean duration of unavailable MTP3/MTP3B signalling link in a Core Network (CN) Circuit Switched (CS) domain for UMTS and combined UMTS/GSM?
Option 1: To evaluate the overall network throughput for packet-switched traffic.
Option 2: To assess the signal strength of User Equipment (UE) in the network.
Option 3: To monitor the performance of the Radio Access Network (RAN) for voice calls.
Option 4: To provide insights into the average time MTP3/MTP3B signalling links are unavailable, impacting circuit-switched traffic.
Explanation: This measurement's primary purpose is to identify and resolve connectivity issues affecting circuit-switched traffic (e.g., voice calls) by understanding the average time MTP3/MTP3B signalling links are unavailable. The other options are incorrect as they pertain to different network performance aspects or aren't directly related to this measurement's purpose.