Service providers strive to maintain networks with high levels of availability and performance. To maintain the networks, the service providers measure performance and perform network diagnostics. Measuring performance and performing network diagnostics typically involves manual verification of functionality or performing individual tests between user agents. Service providers who maintain networks and service providers who use networks can dynamically run tests with operations of a signaling protocol (e.g., session initiation protocol) to diagnose network problems and determine appropriate responses. An agent manager can coordinate the dynamic tests across multiple user agents to gather more information to increase problem diagnosis accuracy.