Hi,

On Wed, Jun 28, 2017 at 08:37:56PM +0200, Pavel Machek wrote:
> Right now, first priority is to get useful quality of the voice
> calls. If Nokia is the only one, then this is perhaps not a big
> problem.
> 
> I'd like to know how Pyra handles this (
> https://pyra-handheld.com/boards/pages/pyra/ ).

It provides a normal PCM interface, check
20161116-DragonFly-MAIN-4G-sch.pdf, page 11 from here:

https://pyra-handheld.com/boards/threads/power-memory-and-schematics.78631/

The Nokia phones are really special in this regard.

-- Sebastian