[Asterisk-Dev] More IAX tests with different codecs

[Steven Critchfield]

Interesting since I have been able to get 14.4 modem conenctions across
both IAX and IAX2 connections with G711 and zapata devices, even with a
17 hop internet connection between asterisk boxes. Seems if IAX itself
was a problem then that would fail quickly. Maybe it is something SIP
related.

On Wed, 2003-05-07 at 16:50, John Todd wrote:
> More IAX tests.
> 
> 1) IAX with GSM
>    Works fine, sounds fine.  No dropouts, mild artifacts (but nothing 
> that is a "problem")
> 
> 2) IAX with G711
>    Works fine, sounds great.  No dropouts, no artifacts, very very 
> faint echo (1/4 second?) - not an issue, but if you crank the volume 
> up all the way to 11, you can hear it.
> 
> 3) IAX2 with GSM
>    2-3 second drops often, mild artifacts
> 
> 4) IAX2 with G711
>    2-3 second drops often, mild artifacts
> 
> 
> During my calls last night, I was unable to reproduce the total audio 
> leg drops, but others have said that it happens frequently with IAX2, 
> and I have had it happen often as well.  The network between the two 
> ends was unsaturated, and throughput tests were >200kbps with no 
> packet loss.
> 
> Tests were done with VAD turned on, and turned off on each SIP end 
> station.  That didn't seem to make much of a difference, but it was 
> interesting to watch bandwidth drop to zero when nobody was talking. 
> We did not experiment with jitterbuffer=  - that will be tonight.
> 
> JT
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-- 
Steven Critchfield  <critch at basesys.com>