[Freeswitch-users] DTMF recognition flaky

Anthony Minessale anthony.minessale at gmail.com
Thu May 7 05:11:54 PDT 2009

you may have a sonus infection

try some of the stuff from here under DTMF


On Thu, May 7, 2009 at 5:16 AM, Jason White <jason at jasonjgw.net> wrote:

> Remko Kloosterman <R.Kloosterman at mtel.nl> wrote:
> >
> >
> > Did you make a wireshark trace yet? You should be able to find out
> > exactly what's going on there, which protocol is used, etc. We've had
> > our share of problems with DTMF over SIP trunks as well.
> I've just discovered that I'm having a similar problem to the one discussed
> in
> this thread. Here are the symptoms.
> 1. If I call FreeSWITCH from my Snom 320 SIP phone, DTMF recognition works
> perfectly. This is also true if I call a friend's FreeSWITCH system.
> 2. If I call a certain VoIP provider from the Snom phone, via FreeSWITCH
> (phone -> FreeSWITCH -> provider) and call the provider's DTMF test, DTMF
> recognition fails to work. Apparently this provider accepts only RFC-2833,
> which is what FreeSWITCH should be issuing - I haven't changed the settings
> in
> the external profile from the defaults.
> 3. If I call the same provider's DTMF test from PortAudio and issue the pa
> dtmf command, the provider recognizes the DTMF traffic correctly.
> I couldn't find any obvious configuration errors on the phone or in my
> internal and external Sofia profiles.
> I'll gladly run tshark if that's the next step to take.
> I can also try setting <param name="pass-rfc2833" value="true"/> in the
> internal profile, but this shouldn't be necessary, since as the wiki states
> in
> documenting this variable, FreeSWITCH should decode and re-encode the
> RFC2833
> data anyway when this is set to false.
> I'll keep working on this, but in the meantime, suggestions are welcome.
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Anthony Minessale II

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