[asterisk-users] DTMF tones in MixMonitor recording

[Patrick Wakano]

Thanks very much for the reply Joshua!
So I guess that setting dtmfmode=auto would be the safest choice in order
to strip out the DTMFs from the recording, right?
Cheers!
Patrick Wakano

On Tue, 1 May 2018, 19:36 Joshua Colp, <jcolp at digium.com> wrote:

> On Mon, Apr 30, 2018, at 11:23 PM, Patrick Wakano wrote:
> > Hello list,
> > Hope you are all doing fine!
> >
> > I have stumbled over some piece of dialplan code in which apparently they
> > were trying to avoid recording the DTMF tones in the wav file. It is
> really
> > messy and I am not sure if this really works. So after a bit of research
> I
> > found this comment (
> > https://community.asterisk.org/t/asterisk-dtmf-record/65040) in which
> it is
> > said:
> >
> > *"Asterisk strips the DTMF from the audio stream when configured for
> > inband, so internal stuff can react to the DTMF and so the other side
> does
> > not hear the tone unless they are using inband (in which case it is
> > regenerated)"*
> > So my questions are, what are the cases in which Asterisk regenerates the
> > DTMFs? Does it cause the recording to have the tone as well, or is it
> only
> > transmitted to the other leg without being generated to the recording
> file?
> > Also, what if one or both legs are RFC2833? From my tests the RFC2833
> > events never show up in the recording, but I just want to confirm that
> this
> > is always true.
>
> If properly configured then Asterisk will always strip and regenerate the
> DTMF tone. You have to purposely misconfigure things to cause it to not get
> stripped. IE: DTMF is actually inband but you configure it for RFC2833.
> Since Asterisk wouldn't be listening to the audio stream, it would go right
> through and get recorded.
>
> --
> Joshua Colp
> Digium, Inc. | Senior Software Developer
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - US
> Check us out at: www.digium.com & www.asterisk.org
>
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