[Asterisk-Dev] More IAX tests with different codecs

[Karl Putland]

On Wed, 2003-05-07 at 16:53, Steven Critchfield wrote:
> 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.
> 

I've had very similar issues using 

Aastra390 <--> Dlink DG-104S <- MGCP -> * <- IAX[2] -> * <--> PSTN
Aastra390 <--> Dlink DG-104S <- MGCP -> * <- IAX[2] -> * <- MGCP -> DG104 <--> Phone

Same problems gsm/g711 fine with IAX spotty wity IAX2

--Karl

> 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
> > _______________________________________________
> > Asterisk-Dev mailing list
> > Asterisk-Dev at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-dev
-- 
Karl Putland <karl at putland.linux-site.net>