[asterisk-users] Outgoing SIP calls dropped after 30 seconds.

[Kurt Knudsen]

Ok, recompiling it now with a 1 instead of XMIT_CRITICAL. Will check
back to see if it worked. Would be nice if it did :)

Thanks,

Kurt

On Fri, Nov 7, 2008 at 3:38 PM, Doug <Doug at natel.net> wrote:
> At 14:15 11/7/2008, SIP wrote:
>  >Kurt Knudsen wrote:
>  >> Specs: Asterisk 1.4.22 running behind a SonicWall (transparent mode)
>  >> with a public IP address. We have our phone system setup as 172.16.2.x
>  >> that connect through the SonicWall to Asterisk. Incoming calls work
>  >> flawlessly and we no longer get one-way audio. We are only using SIP
>  >> (3 trunks now, instead of 2) and having all 3 in use is not an issue.
>
>
>
>  >> Question: Why does it sometimes work and sometimes not? This makes no
>  >> sense and it happens on all phones. Any suggestions?
>  >>
>  >>
>  >>
>  >
>  >
>  >We see this on occasion. It sounds a lot like Asterisk doing its usual
>  >routine of deciding that you can't POSSIBLY have a call going through
>  >because it can't receive an ACK response properly.  Asterisk tries
>  >several times to send an ACK and get a response. If the remote system
>  >routes ACKs differently than it routes everything else, often times
>  >those ACKs get lost, and Asterisk assumes that the call can't be
>  >working, so it destroys it.
>  >
>  >ACK handling is a bit tricky in the real world, and we've run across
>  >countless incorrectly-configured SIP servers that don't handle it
>  >properly, so calls to them last just about exactly 30 seconds and then
>  >drop.
>  >
>  >There is, unfortunately, no way to turn off Asterisk's 'intelligent'
>  >behaviour in this scenario short of possibly patching the code.
>
> http://lists.digium.com/pipermail/asterisk-users/2007-May/187951.html
>
>
> _______________________________________________
> -- Bandwidth and Colocation Provided by http://www.api-digital.com --
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>