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:<div>
<br></div><div><a href="http://wiki.freeswitch.org/wiki/Packet_Capture">http://wiki.freeswitch.org/wiki/Packet_Capture</a></div><div><br></div><div>-MC</div><div><br><div class="gmail_quote">On Mon, Aug 15, 2011 at 3:48 PM, David Bolen <span dir="ltr"><<a href="mailto:db3l.net@gmail.com">db3l.net@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">I'm encountering what I would probably best describe as some bleed<br>
through of inbound DTMF when in a conference, and I was wondering if<br>
anyone might have suggestions for likely causes or troubleshooting?<br>
<br>
DTMF detection itself seems fine, and appears to properly be using<br>
rfc2833 (the SDPs all show include "a=rtpmap:101 telephone-event/8000").<br>
I get "RTP RECV DTMF" logs for each digit that is recognized.<br>
However, a reasonable percentage of the time, some small fraction of<br>
the DTMF appears to be heard by the conference as a whole. Never the<br>
whole thing, and sometimes it's a bit distorted (though that may just<br>
be due to it being so short). Almost as if a small portion of a sound<br>
sample makes it through.<br>
<br>
For testing, I'm using internal phones with direct SIP connections to<br>
the switch so no PSTN or gateways involved, though it also occurs with<br>
a PSTN caller coming in through multiple gateways. For the internal<br>
phones, I've tried both a physical phone through a PAP2T, as well as a<br>
PC soft phone.<br>
<br>
This is with git-868d823 from Jul 29, so a few weeks old but reviewing<br>
the more recent commits there weren't any seemingly related to DTMF or<br>
conferencing.<br>
<br>
Any suggestions on places to look or things to try would be most<br>
appreciated.<br>
<br>
-- David<br>
<br>
<br>
<br>
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</blockquote></div><br></div>