[Freeswitch-users] Double-dtmf detection in IVR when a call is routed through FreeSWITCH

Milena testeador01 at gmail.com
Wed May 27 07:22:38 PDT 2009

Check the freeswitch log when the dtmf are being received, most likely your
device is sending them both as Dave says, maybe the telephone you're dialing
with sends it both inband and rtp. What does the log says?

2009/5/26 Drew Ozier <drew.ozier at gmail.com>

> I've got a configuration where I receive inbound calls and dial out to a
> pre-determined 800-number based on the DNIS of the call. I set <action
> application="start_dtmf"/> and have everything set up so that DTMF only
> comes to me via inband. When I'm providing DTMF data to the IVR, it will
> recognize a single keypress as a double-tap. My FreeSWITCH logs only contain
> one DTMF entry, but when I listen to the receiving end of the call, I can
> hear a hiccup in the DTMF tone that is getting played. When I do not use
> 'start_dtmf', this problem goes away. I need inband DTMF detection, but I
> can't have it messing up the audio stream. Any thoughts?
> -Drew Ozier
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