Can only hear/speak during a phone call when on speakerphone

[bcnaz]

Hi. I have a new problem with my Pinephone, which is running the latest stable Majaro ARM w/ Phosh.

When I make a call, I cannot hear the phone ring, and when the receiver answers, I can't hear them and they can't hear me.

If I press the "speaker" button and switch to speakerphone, I can hear and be heard, but with a nasty echo audible on the receiver's end.

Has anyone else experienced this problem? What do you think might be the cause?

I had another problem with telephony earlier this month that was resolved, but now this new problem has emerged. The former problem was discussed here: https://forum.pine64.org/showthread.php?tid=14857

The only thing I've done with my phone recently that may have caused a problem was a failed attempt to install Signal protocols, Could that have possibly interfered with these functions?

More importantly, as I use Pinephone as my "daily driver"... how might I fix this problem? TIA. 

***
1)  for the echo,  try turning down the microphone input volume.
        For me that reduced the noise a lot that the other person hears,  a big  'improvement',  but not a total fix.
2) Easiest fix for your main problem would be a fresh installation,  but a hassle if you have a lot of stuff 'saved' on your existing installation.