[asterisk-users] SIP DTMF Troubleshoot

[Andrew Joakimsen]

Everything seems find on my end. Here's the setup:

Linksys SPA922 <-----> Asterisk 1.4 <-------> Quintum T1 gateway

Between Asterisk and Quintum if I use G729 RFC2833 DTMF works with no
issues, however if I use uLaw this is where there is a problem. For
some reason the Quintum gateway does not support uLaw + RFC2833.

Also does not matter if I use Asterisk 1.2 or a grandstream or the
proverbial SIP tin can; The scenario is always the same.


On Jan 28, 2008 7:03 PM, Alex Balashov <abalashov at evaristesys.com> wrote:
>
> I think your best bet is to do a packet capture and look for RTP packets
> with an RTP Event payload ("rtpevent" display filter).
>
>
> On Mon, 28 Jan 2008, Andrew Joakimsen wrote:
>
> > How can I debug SIP DTMF? If I do 'sip set debug peer xyz' I see no
> > messages related to DTMF... or if I just do a global SIP debug for
> > that matter.... I am using RFC DTMF but it's not being passed to the
> > PSTN and I need to debug this further. I've tried to increase the
> > verbosity and the debug ('set debug n') and that didn't help either. I
> > assume this is because even RFC2833 sends the DTMF as RTP which
> > wouldn't show up anyways.... but how to troubleshoot DTMF issues?
> >
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> --
> Alex Balashov
> Evariste Systems
> Web    : http://www.evaristesys.com/
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> Direct : +1-678-954-0671
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>
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