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Audio devices

The audio devices screen with speaker and microphone choices and test buttons Settings › Audio devices lists every input and output the media stack can see, and marks the ones in use. This is not the same as the speaker button on a call: that is one choice that moves input and output together, while these can be set independently — which is the whole point of choosing hardware.
  • Test speaker plays left, then right, then both, out of the speaker chosen above, with the microphone left alone.
  • Test microphone feeds you back at 8 kHz, which is what a call on this account actually sounds like. It is deliberately not flattering.
A Bluetooth headset carries both directions on one link, so choosing it for either end moves the other with it. The screen says so rather than letting you set an impossible pair.

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The SIP log

The Diagnostics screen showing SIP registration events Settings › Diagnostics is a live view of what the SIP stack is doing — registrations, calls, failures, and the reason each one gives. It is also reachable from Show logs on the SIP account screen, which is where you will want it when a registration will not take. Copy log, Share and Clear are along the bottom. Share attaches it to a mail or a message so you can send it to whoever is helping.
Authorization and digest headers are stripped before anything is written down, so a log you send does not carry your password. The log is kept in the app’s own storage rather than in Files, and Clear deletes it from disk as well as from the screen.

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Reading it

Most faults announce themselves plainly. A call that reaches the in-call screen carries its own diagnosis: the quality pill names the codec that won, the round-trip time, and the signal. A call that sounds bad with 40 ms and four bars is not a network problem.