Hi Brian,

Thank you for taking the time to respond.  We are using Sangoma cards with Freeswitch as a gateway between the PSTN and our internal network which uses SIP.  We prefer not to use inband with SIP due to numerous other potential issues, and are trying to determine why FS sometimes creates double DTMF events.

Thanks for the tip though!
Joann

-----Original message-----
From: Brian Foster <bdfoster@endigotech.com>
To: FreeSWITCH Users Help <freeswitch-users@lists.freeswitch.org>
Sent: Mon, Jul 16, 2012 23:34:17 EDT
Subject: Re: [Freeswitch-users] Duplicate DTMF Events - Please Help!

Rfc2833 is for sip, not for analog. Other than that I don't have much to offer. Try using inband only.

Brian Foster
Endigo Computer LLC

Sent from a mobile device.

On Jul 16, 2012 6:50 PM, "Joann R DeJesus" <Joann.DeJesus@convergys.com> wrote:

Hello All,

 

I hope someone has experience this issue and can quickly assist me!  We are supposed to be going live with a customer in a couple of days and need to find a resolution quickly in order to stay on track…

 

We are using Freeswitch with Sangoma T1 cards to bridge TDM with our internal VoIP system. Call flow is as follows:

 

PSTN --> T1/Sangoma cards --> Freeswitch --> IVR

 

I have configured Freeswitch for RFC2833.  When I make a call to the IVR from a landline or cell phone and press "5" at a prompt, FS will sometimes send two separate DTMF events to the IVR.  This causes the IVR to receive "55" which then sends the call to the incorrect destination.

 

I can verify with Wireshark that FS is sending two separate RFC2833 events.  For some reason, this is exacerbated with heavy call volume (easy to reproduce during load testing).  Has anyone experienced this symptom or have any ideas what I can check?

 

Thanks in advance for any assistance!!

 

- Joann

 


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