An external contact center testing system is integrated with an internal monitoring and diagnostic system to identify and verify a fault condition, and to determine the cause of such fault condition. Test data for each of the stimuli launched into the call center from the external testing system are synced with the monitoring results data generated by the internal monitoring system. The synced results can be analyzed to verify that a true fault has occurred and also to identify both failure conditions and specific hardware malfunctions giving rise to the noted failure. The internal monitoring system can interface with the external testing system to cause one or more testing stimuli to be launched by external testing system. The internal monitoring data can also be linked to the external testing data for drill-down viewing by a user.