SIP call problem
Did you find a solution? The same problem. LOS 14/15/16 Dialer built in SIP call microphone gain very very low. Zoiper, sound recorder, gsm call, stb o.k.I started asking in general forum for help in finding out mixer_paths.xml entry for mic volume of VOIP/SIP calls
https://forum.xda-developers.com/android/help/mixerpaths-xml-entry-mic-volume-voip-t3768098