A system and method for monitoring, analyzing, and testing calls between computers of remotely working call center agents and callers in real-time. A real-time testing module implemented as a browser extension or a side-loaded application relays live call information and on-demand or periodic passive-test results to a test and dashboard server for analysis and triage. Additionally, the real-time testing module may actively test calling conditions between the agent's equipment and a distant caller by suspending the agents calls and tasks, intercepting and taking command of the agent's audio equipment, and placing a test call to a testing server. Thus, allowing actual data to be used in troubleshooting issues, rather than simulations or synthetic data. Dashboards with analytics and predictions are made available in both the browser application and an end point server for agents and operations/management personnel respectively.