Which of the following is NOT a common metric used to evaluate TSC performance?

User satisfaction rating is not typically a common metric used to directly evaluate Tactical Session Controller (TSC) performance. In TSC performance evaluation, the focus is more on quantifiable metrics that directly reflect the efficiency and effectiveness of call handling and media transfer.

Metrics such as session failure rate, call setup time, and average media quality scores provide concrete measurements that can be monitored and analyzed for operational performance. For instance, the session failure rate calculates the percentage of calls that did not complete successfully, offering insights into system reliability. Call setup time measures the time it takes to establish a connection, influencing user experience by indicating efficiency. Average media quality scores help assess the quality of the voice or video transmission, affecting overall communications effectiveness.

While user satisfaction may ultimately be influenced by these metrics, it is more subjective and less directly quantifiable in the context of TSC performance evaluation. This makes it less suitable as a standard performance metric in the same way the other options are.