[Freeswitch-users] Strange DTMF Tones On Inbound Calls

Daniel Knaggs Daniel.Knaggs at realitysolutions.co.uk
Tue Apr 17 12:13:17 MSD 2012

I've raised a ticket with Sangoma via this link: http://sangoma.com/support/contact_support.html

Let's see where we go...

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Michael Collins
Sent: 16 April 2012 22:12
To: FreeSWITCH Users Help
Subject: Re: [Freeswitch-users] Strange DTMF Tones On Inbound Calls

I still suspect something in FreeTDM. From Nathan's perspective that would be "inside" FreeSWITCH since that's the TDM stack we use. I highly recommend you open a trouble ticket with Sangoma and have each person who is experiencing the issue put a comment on the case and offer to supply configs, logs, and/or access that Sangoma would need to do troubleshooting.

On Fri, Apr 13, 2012 at 12:35 AM, Daniel Knaggs <Daniel.Knaggs at realitysolutions.co.uk> wrote:
That's very interesting, Nathan.

Now that makes three of us, two using the Digium cards and one using a Sangoma.

It very much looks like something FreeSwitch is doing, perhaps the DTMF detection is far too sensitive?  Are DTMF tones for an ISDN line inband or do they come in on the D-channel?

Michael - any ideas what we can all do?

From: Nathan Eisenberg [mailto:nathan at atlasnetworks.us]
Sent: 13 April 2012 00:21
To: Daniel Knaggs
Subject: [Freeswitch-users] Strange DTMF Tones On Inbound Calls

I'm having the exact issue you're describing, with the same card.  However, what's interesting to me is that if I fire up Asterisk instead of freeswitch, the phantom DTMF problem disappears entirely.

So it's *something* inside Freeswitch, at least for me.  Would be interesting if you're able to do a similar test.
Nathan Eisenberg
Atlas Networks | Sr. Systems Administrator
office: 206.577.3078  |  www.atlasnetworks.us

Daniel Knaggs
Software Developer

Reality Solutions Ltd
1 Global Business Park
Hamburg Road
Kingston upon Hull
East Yorkshire, HU7 0AE

Tel:    01482 373104
Mobile: 07932 408313
Email:  mailto:Daniel.Knaggs at realitysolutions.co.uk

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