[Asterisk-Users] one way choppy sound problem !

[Steven Critchfield]

On Fri, 2004-01-02 at 11:35, Nicolas Gudino wrote:
> I have a similar problem, with GS phones, X-Lite or Kphone. I tried all
> the codecs with the same result. Choppy sound in the direction SIP-Phone
> -> pstn, but crystal clear sound the other way around. The only
> difference in my case is that I have two asterisks servers connected
> together via IAX2, the PSTN call is received in one asterisk, while the
> sip phones are in the other asterisk. Ex: 
> 
> pstn -> * --iax2--> * ->sip phone (GS, Xlite or Kphone)
> 
> If I use an Xlite in the same asterisk as the pstn line, the sound is
> perfect in both ways. But when I answer the call in the second asterisk,
> the sound from the sip phone to pstn is choppy, with or without silence
> detection, and the sound from pstn to sip phone is perfect.
> 
> The asterisk server with the pstn line is an old pentium 133, maybe
> thats the problem, I will try with a better machine and see how it goes.

What is the ping times between your 2 asterisk servers? In the archive I
have documented before that IAX jitter buffer sometimes has problems on
short ping time links. At the time we where on a private T1 with 4ms
ping times. We re enabled our jitter buffer now that we are on a DSL
connection and our ping time is between 56 and 70 ms. 

> On Fri, 2004-01-02 at 06:23, Dawid Mielnik wrote:
> > Hi all,
> > 
> > I have my asterisk setup as following:
> > 
> > 	    IP               2 x E1
> > x-lite <-------> Asterisk -------> PSTN
> > 
> > 
> > When I place a call from x-lite to PSTN, the quality of the sound in the
> > direction x-lite -> PSTN is very bad. That is, the voice of the x-lite user,
> > heard by the PSTN user is choppy and makes communication not very pleasant.
> > The sound is choppy as if bits of data were lost. The strange thing is that
> > the x-lite user hears the PSTN user fine !
> > 
> > In x-lite, I have swithed off sience detection (transmit silence - yes),
> > this has improved the sound quality but did not eliminated the problem. I
> > have fed a countinious sound into the microphone and still got chops in the
> > sound. I have also tried changing the codecs gsm, alaw, ulaw - but I get the
> > same problem with all of them. Maybe the problem lies somewhere in audio
> > buffering settings on x-lite ?
> > 
> > Has anyone ever had this sort of problem and managed to deal with it ? I
> > would greatly appreciate your help !
> > 
> > Best regards,
> > 
> > Dave
> > 
> > 
> > _______________________________________________
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> > Asterisk-Users at lists.digium.com
> > http://lists.digium.com/mailman/listinfo/asterisk-users
> > 
> 
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-- 
Steven Critchfield  <critch at basesys.com>