Originally Posted by Globus.gd
@skvalex You were writing that on Android 10 after 3.2.6 only MIC is recorded, that is not true, I get both voices recorded (standard API)
You get both voices recorded through the mic. Some phones have microphones near the speaker, so the other side is also captured with a decent quality. But don't rely on that. Any firmware update (even minor one), can add an echo cancellation. Which will mean the system will filter the other side's voice before sending audio data to the app.
I mean, in your case the app is requesting sound from the microphone, not from the phone line. So if you hear the other side on the recording - it must be considered as a side effect, which may be fixed by Google/your manufacturer in the future.