[Freeswitch-users] Dropped and duplicated DTMF digits

[Michael Jerris]

can you confirm if this is still an issue in latest git master, and if so,
please collect pcap and full debug log of the call and create a Jira.

On Jul 22, 2014, at 9:06 AM, Chris Young <Chris.Young at enghouse.com> wrote:

   Hi all,



We are experiencing problems with DTMF collection using FreeSWITCH 1.4.6.
The symptoms are missed or duplicated digits when decoding DTMF sent using
RFC 2833 from Cisco phones; for example, given the sequence:



                1 2 3 4 5 6 7 8 9 0 #



we might typically end up with something like this after FreeSWITCH has
processed the received RTP:



                1 2 3 5 7 7 8 9 9 #



Using Wireshark, we can see that all the expected RTP events are present on
the wire but FreeSWITCH seems to have difficulty in processing them all
consistently. I've tried setting the following manual RTP bugs (bit of
guesswork here I'm afraid, these may or may not be relevant):



                IGNORE_DTMF_DURATION

                ACCEPT_ANY_PACKETS



but unfortunately neither made any difference. Are there any other settings
we could try which might help? Or is this a known problem with some other
workaround?



Regards,

Chris



Chris Young
Software Engineer
<image05853e.PNG>
t:  +44 118 943 9249
e:  Chris.Young at enghouse.com
w: www.enghouseinteractive.co.uk
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