[Freeswitch-users] DTMF bleed through in conference

[Michael Collins]

Are the devices that send the DTMFs using 2833? Sounds like possibly they
are using inband. I would get a pcap with RTP of the conference and see
what, exactly, the device is sending. Some tips for this can be found here:

http://wiki.freeswitch.org/wiki/Packet_Capture

-MC

On Mon, Aug 15, 2011 at 3:48 PM, David Bolen <db3l.net at gmail.com> wrote:

> I'm encountering what I would probably best describe as some bleed
> through of inbound DTMF when in a conference, and I was wondering if
> anyone might have suggestions for likely causes or troubleshooting?
>
> DTMF detection itself seems fine, and appears to properly be using
> rfc2833 (the SDPs all show include "a=rtpmap:101 telephone-event/8000").
> I get "RTP RECV DTMF" logs for each digit that is recognized.
> However, a reasonable percentage of the time, some small fraction of
> the DTMF appears to be heard by the conference as a whole.  Never the
> whole thing, and sometimes it's a bit distorted (though that may just
> be due to it being so short).  Almost as if a small portion of a sound
> sample makes it through.
>
> For testing, I'm using internal phones with direct SIP connections to
> the switch so no PSTN or gateways involved, though it also occurs with
> a PSTN caller coming in through multiple gateways.  For the internal
> phones, I've tried both a physical phone through a PAP2T, as well as a
> PC soft phone.
>
> This is with git-868d823 from Jul 29, so a few weeks old but reviewing
> the more recent commits there weren't any seemingly related to DTMF or
> conferencing.
>
> Any suggestions on places to look or things to try would be most
> appreciated.
>
> -- David
>
>
>
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