Ok, further testing... The micrphone levels by default are waaaay to high, so that is causing it to be blown out. Moving mic input to the lowest level greatly improves the quality. It is still a…
Apparently the Pinephone microphone sucks when powered (e.g. via USB-C), which it was when I made the first two test calls. I made a call without it powered, and it was better, but still crappy.
I installed Moblin on a Pinephone (not Pro).
I can't test mobile phone modem because I am in the mountains.
I did two test phone calls via VoIP/SIP and asterisk. The call went through, but…
I had a Purism Librem5 sitting around from a few years ago. It is version "Chestnut". The current shipping version is "Evergreen" I think (they are in alphabetical order).
I was able to flash…