Debugging Android 14 WebRTC Disconnects on a coturn Relay Path

I recently wrote up a debugging case around Android WebRTC, coturn, TURN relay, and ICE failures. This is the anonymized version because the useful part is the debugging method, not the original environment.

Context

Android WebRTC audio/video call.

The service originally worked mostly on an internal network.

A TURN relay path through coturn was introduced for more complex network boundaries.