[Freeswitch-users] How to turn off SW DTMF detect (for DTMF talkoff issue)

Michael Jerris mike at jerris.com
Thu May 6 17:24:31 PDT 2010

I have never seen these dropouts and we use the dtmf detection without issue.  Try contacting sangoma to see if they have a fix for this, I suspect they do already have this in a newer release.


On May 6, 2010, at 2:59 PM, Robert Hadley wrote:

> Our Freeswitch implementation has two second audio dropouts on calls that pass through the Sangoma PRI card caused by DTMF talkoff.
> We know how to turn HW DTMF detection off, but then FS automatically enables software DTMF detect.  How do we prevent SW DTMF detection in FS?
> Our attempt to manage when HW DTMF detection is active is not very clean (see pastebin report of things we tried at http://pastebin.freeswitch.org/12923).
> I tried using the start_dtmf and stop_dtmf applications in the dialplan but they didn’t work to prevent talkoff or splits, and the stop_dtmf application stopped audio for internal calls.  Is there a better way to control HW DTMF detection or DTMF line splits from the dialplan?

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