[Linphone-users] Audio vs. video priority?

[Matt Lawson]

I am using Linphone with Asterisk and it works pretty well, particularly 
when bandwidth is plentiful.  However, we are also trying to connect 
some machines which are using residential DSL lines (maximum 256kbps 
upstream) and we always eventually run out of bandwidth (remember they 
may have other things happening than just Linphone).

What I notice is that the video stays together pretty well, but the 
audio breaks up horribly when bandwidth starts to run out.

My question is, is there any way to give the audio stream "priority" 
over the video?  With a video call, the image is a 'bonus' but the users 
will expect the audio to be perfect, or at least understandable.

The way our Linphone is now (it is not exactly like the CVS version, 
because it is a few months old), it uses the normal audio timer sync 
(20ms or whatever it is) and uses "no sync" for the video.  We 
discovered that this gave the best image quality.  But I wonder, is that 
causing the audio to be lost in favor of video?  Should I put the video 
on a timer also?  Or should I change the audio to "no sync" as well?  Is 
there any other way to tweak it so that audio will be sure to come 
through at the expense of the video?

Suggestions welcome.  Thanks.

- Matt