[asterisk-biz] IAX Channels limit on Asterisk 1.4.17

[Nitzan Kon]

After doing some googling I think I found your problem.. if you look in
chan_iax2.c you'll see there is a hard-coded limit of 256 channels:

} else if (iaxthreadcount > 256) {
ast_log(LOG_NOTICE, "limiting iaxthreadcount to 256\n");
iaxthreadcount = 256; 

and:

} else if (iaxmaxthreadcount > 256) {
ast_log(LOG_NOTICE, "Limiting iaxmaxthreadcount to 256\n");
iaxmaxthreadcount = 256;

You could pretty easily get around this limit - just edit chan_iax2.c
and increase those limits, recompile, and set whatever limits you like
in iax.conf. The only question left to be answered is whether there
actually is a GOOD REASON the developers set that limit. But I think
this is probably a question for the -dev list.

Your other (and perhaps better from a reliability standpoint)
alternative is just to run multiple iterations of asterisk on the same
box. Should be pretty simple- just bind to either a different IP
address on the same box (IP aliasing), or different ports on the same
IP address.

Hope this helps. Let me know if you have any questions.

  -- Nitzan Kon, CEO
     Future Nine Corporation

--- Craig Lawrence <craig at mytel.net.au> wrote:

> Has anyone managed to go past 256 concurrent IAX channels on Asterisk
> 1.4 (specifically 1.4.17)?  We seem to have struck a limitation on
> the
> current build.  Digium support is looking at the issue but there
> doesn't
> seem to be a working fix at this stage.  
> 
> I'm not looking for tech advice, just wondering whether other
> providers
> are able to run more than 256 IAX channels on a single server. We're
> running multiple Dell 2950 machines with 2 x Xeon 5160's in each.
> 
> Thanks
> 
> Craig Lawrence
> 
> 
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