Agreed. Sounds like an analog device not clamping inband DTMF -> RFC 2833 events properly (or quickly enough). Grab a pcap and look at the audio. See if you can see DTMF in the audio stream itself. On Mon, Aug 15, 2011 at 7:09 PM, Michael Collins <msc@freeswitch.org> wrote:
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@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
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
FreeSWITCH-users mailing list FreeSWITCH-users@lists.freeswitch.org http://lists.freeswitch.org/mailman/listinfo/freeswitch-users UNSUBSCRIBE:http://lists.freeswitch.org/mailman/options/freeswitch-users http://www.freeswitch.org
-- Kristian Kielhofner