[asterisk-dev] IAX2 and jitterbuffer problems

[Martin Vít]

Mihai Balea wrote:
> Hello all,
>
> I have noticed that there have been some discussions recently about 
> problems with IAX2 and jitterbuffer.
> We are heavily using these components in our production systems, but 
> so far we have not noticed any issues with the latest versions of 
> Asterisk.
> However, if people have hit problems, then we would be definitely 
> interested in hearing about them and maybe helping solve them.
>
> So I would like to ask anybody who experienced such problems to please 
> speak up and provide as many details as you can.  

If bridging ilbc SIP -> Zap channels, transcoding is done before frames 
are queued to jitter (depends on SETUP direction) and thus interpolation 
is not applied. I've made nasty workaround in our production system in 
channel.c so translating is always applied to Zap channel.

> I would be especially interested in ways to reproduce the issues.  We 
> have a tool that can be used to stress test chan_iax and, by 
> extension, anything in Asterisk. We could probably use it to hit bugs 
> that show up only under high load.
>
> Cheers,
> Mihai
>
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-- 
Martin Vít
LAM plus s.r.o.
http://www.lam.cz/
Tel.: 605 267 610

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