[alsa-devel] [pulseaudio-discuss] Using UCM with PulseAudio

[Mark Brown]

On Mon, Jul 23, 2012 at 09:33:27AM +0300, Tanu Kaskinen wrote:

> The N9 hardware also has several possibilities for loopbacks. We used
> one for the sidetone in calls (sidetone means playing back your own
> voice back to you, and it's a mandatory feature in mobile phones,
> AFAIK).

It's not mandatory but it's certainly pretty standard.  Some
manufacturers don't do it though.
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