use stream as audio device

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Hi there,

I wanted to make a voip application for embedded devices, and wanted to 
use Pjsip libraries.
This application won't use any gui, but simple i/o lines to start or 
stop call.

Embedded boards often don't have audio devices, or maybe have only audio 
output, so I made a simple audio sampler with a microcontroller that 
outputs the stream to a serial line (such as rs-232).
In linux it is easy to listen to the stream with "play /dev/ttyS0" (plus 
some format parameter).
But if I want to use that stream with another application such as pjsip, 
that's not so easy :(

So I want to ask you a piece of advice. Is it simpler to add a module to 
pjsip, or to make a kernel module to add a virtual sound card ?

Thanks to all,
-alez
 
 
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