How does your network carry voice?
This measures this browser and this device's path to this endpoint, right now - the device, the browser's media stack, your access network, the ISP, transit, and the endpoint itself. It is not an ISP verdict and not a speed test.
Runs four codec trial blocks (Opus and G.711/PCMA, one at a time) plus the transport probe, about a minute total. Sends and receives a few megabytes of synthetic audio and probe messages. No microphone access. A one-minute window cannot observe rare events; treat a clean result as "clean for a minute", not "clean".
Connecting…
Live observation lanes as the run progresses. Each lane is one observation point on its own clock (browser encoder, server socket, server sender, browser decoder); vertical position within a lane is the gap between consecutive events (line = 20 ms cadence). Lanes marked "not observed" delivered no events - that is reported, never hidden. Cross-lane horizontal alignment is approximate.