[Freeswitch-users] Issues detecting DTMF tones

Brian West brian at freeswitch.org
Thu Apr 16 14:27:43 PDT 2009

What are you doing exactly?  Can you provide us an example.


On Apr 16, 2009, at 3:49 PM, Pete Mueller wrote:

> Hey guys.  Has anyone else experienced the inability to detect/ 
> receive DTMF tones?  Just yesterday I had about 4-5 hours where One  
> of my IVR scripts would not detect 1, 2 or 3, but detected the other  
> digits perfectly.  If I removed the sound file that was playing, and  
> substituted silence it worked, add the sound file in, and it broke.   
> I have a strong feeling that this is not an issue with FS, but with  
> an upstream system.  But wanted to know if anyone has seen this  
> before, and how they went about identifying the culprit and/or  
> fixing it.
> Some background:
> -          Using FS trunk
> -          Both legs of the call were via SIP gateway.
> -          Setting loglevel to 9 (console and sofia) showed that the  
> RTP packets were not received by FS for 1/2/3 but were received for  
> other digits
> -          Both legs of calls were to/from ATT cell phones
> -           Was using session:setInputCallback() to receive tones,  
> did not test with playAndGetDigits()
> Thanks for any help.
> -pete

Brian West
brian at freeswitch.org

-- Meet us at ClueCon!  http://www.cluecon.com

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