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add support for Bluetooth phone calls

Describe your issue

What's the expected behaviour?

MVP: When making a phonecall I should be able to route the audio over a bluetooth headset.

Ideal behavior: When I pair my phone with a headset, speaker, or car audio system, the phone should not only show up as a "media player" but also as a "phone". This would allow me to dial phone calls from the headset/speaker/car/device controls and (optionally) share my contacts with the headset/speaker/car/device.

What's the current behaviour?

Currently, PostmarketOS does not support the "phone" bluetooth profile. Further, pulse audio does not (or cannot?) force-route phone audio over a "media" audio device. This means that I have no way of using my bluetooth device for a phone call.

How to reproduce your issue?

Get out a postmarketOS phone and pair it with a set of headphones or a speaker or a car that supports a "phone" bluetooth profile. Notice that it shows up on the speaker/device/car as a "media player" but not as a phone. To further confirm this bug, attempt to route your phone call audio over your bluetooth headset. It will not work.

What device are you using?

pine64-pinephone

On what postmarketOS version did you encounter the issue?

  • edge (master branch)
  • v21.03
  • v20.05

On what environment did you encounter the issue?

Phone environments

  • Phosh
  • Plasma Mobile
  • Sxmo

Other

  • No environment
  • GNOME
  • KDE Plasma
  • Kodi
  • MATE
  • Shelli
  • Sway
  • Weston
  • Xfce4
  • fbkeyboard
  • i3wm

How did you get postmarketOS image?

What's the build date of the image? (in yyyy-mm-dd format)

2021-03-31

Additional information

This is basically a duplicate of #779 (closed). However, that issue is only about the oddly specific case of using a Pinephone with a Toyota RAV4 2017. This bug report is about the general issue of bluetooth phone calls on postmarketOS.

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