[Freeswitch-users] Dropped and duplicated DTMF digits

[Chris Young]

Hi, thanks for your feedback.

We are not using start_dtmf. I will try to test with 'master' and raise a ticket on JIRA if necessary.

Thanks.

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Steven Ayre
Sent: 22 July 2014 15:52
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] Dropped and duplicated DTMF digits

Also whether you are / aren't using start_dtmf (if you're actually getting RFC2833 don't use it).

On 22 July 2014 14:28, Michael Jerris <mike at jerris.com<mailto:mike at jerris.com>> wrote:
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<mailto: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
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