Part of the reason why I bought a Fairphone 3 was because it supported recording calls using the Call Recorder on F-Droid.
However, after upgrading to Android 10, call recording stopped working.
The call recorder still makes an audio file (
.ogg) that is as long as the call, but it is nothing but silence. I have tried all possible recording sources: “Auto”, “Voice Line”, “Mic”, “System Default”, “VoIP”, “Voice Recognition”, “Camcorder”, “System RAW”; but none of them work.
(I have made a support request.)