Exactly, because the detector can get false positives too.  Upstream sometimes will not squelch the entire DTMF out and some may slip thru and still get picked up by the inband detector.
--
Brian West
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On Mar 6, 2014, at 7:00 AM, Guillermo Ruiz Camauer <grcamauer@gmail.com> wrote:

> If you are using RFC-2833, you do not need to "start_dtmf".  I believe that is only used when you are receiving DTMF inband.  If your provider sends RFC-2833, just disable inband DTMF.
>
> Guillermo
>


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