Re: Voice calls over qmi was Re: Incoming sms problem on Motorola Droid 4

[Harald Welte <laforge@gnumonks.org>]

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Hi Denis, Pavel, Marcel,

On Fri, May 11, 2018 at 08:02:01PM -0500, Denis Kenzior wrote:
> This reminds me... Weren't you the one who mentioned that you got voicecalls
> working on QMI devices?  Does that include the circuit switched control
> operations (e.g. dial, etc) as well?  Any chance that code might be
> upstream-able?

let me pull in Alexander "lynxis" Couzens into the loop, he has been doing all
QMI / ofono related developments for us in the Osmocom project.

My knowledge is that we're testing our network-side stack with voice calls
related tests (via ofono/QMI) for quite some months, but lynxis would know
all related details.

As there are no modems that reliably can deliver the actual audio data via USB
(aside some non-supported outdated experimental firmwares), we're only testing
the signaling plane so far.

We're building a custom board that contains four PCM bus slaves (at different clocks!)
in order to pick up the audio/voice data, but this doesn't exist yet.

See http://laforge.gnumonks.org/blog/20170902-cellular_modems-voice/ for more background
on the user/voice plane.

-- 
- Harald Welte <laforge@gnumonks.org>           http://laforge.gnumonks.org/
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