[Oddskar]

This is due to PulseAudio not having proper support for decent quality HFP/HSP. There was a PR to PulseAudio for this exact thing that seemed to have been completely stranded: https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge...

Edit: actually there might have been some movement on this after all? Some comments in that ticket seem to indicate that this has been improved on master.

[12ian34]

Thanks for linking this, I hadn't come across this before. You're right there does seem to be some very recent progress. I'll have a go with what's in the master branch there.

[rombert]

The latest development version (unreleased) of Pulse Audio has great support for HFP with WBS/mSBC.

I've been using it for weeks (months?) with great results.

[Oddskar]

Wow, wonderful news. Thanks!