Audio out to phone

Audio out to phone

[Dale Mellor]

Does anybody know of any tricks needed to get audio to go out through
an ongoing phone call?  Everything in my setup looks good, with all the
right devices and settings in bluetoothctl, pavucontrol (including
correct headset/handsfree profiles) and I can hear the caller, but they
are only getting silence from my end.  I am using the pulseaudio
asynchronous API, which works well enough playing through speakers but
I can't get sound through the telephone (an Android device, which works
perfectly well with my car's headset).

bluez5: 5.51
ofono:  1.30
pulseaudio: 13.0
debian: 10 (stable)
linux: 5.3.0

I'm quite desperate to get this sorted, so if it is an unsolved problem
perhaps some pointers to where the issue might be will help me to help
you debug the situation?  As you see from the updatedness of the
packages, I have built them all from source and can dig if necessary.

Thanks in advance for any help,
Dale

Re: Audio out to phone

[Luiz Augusto von Dentz]

Hi Dale,

On Sun, Oct 27, 2019 at 11:07 PM Dale Mellor <bluez-2hxy5d@rdmp.org> wrote:
>
> Does anybody know of any tricks needed to get audio to go out through
> an ongoing phone call?  Everything in my setup looks good, with all the
> right devices and settings in bluetoothctl, pavucontrol (including
> correct headset/handsfree profiles) and I can hear the caller, but they
> are only getting silence from my end.  I am using the pulseaudio
> asynchronous API, which works well enough playing through speakers but
> I can't get sound through the telephone (an Android device, which works
> perfectly well with my car's headset).
>
> bluez5: 5.51
> ofono:  1.30
> pulseaudio: 13.0
> debian: 10 (stable)
> linux: 5.3.0
>
> I'm quite desperate to get this sorted, so if it is an unsolved problem
> perhaps some pointers to where the issue might be will help me to help
> you debug the situation?  As you see from the updatedness of the
> packages, I have built them all from source and can dig if necessary.

We will need quite a bit more information to help you, like btmon,
journal of the components involved (bluetoothd, pulseaudio and ofono).
If I got it right that is the audio path of your mic -> loopback ->
bluetooth-src -> sco socket -> hci -> usb iso endpoint that is not
working? There can be quite many things wrong actually, for the mic
being muted to the usb endpoint not working, the later is not uncommon
but you did hear the other side of the call so maybe that is not it.

> Thanks in advance for any help,
> Dale
>
>


-- 
Luiz Augusto von Dentz