[asterisk-users] double DTMF digits

Matt Desbiens desbiensm at gmail.com
Thu Aug 26 15:51:04 CDT 2010

We've actually had issues with Flowroute in the past where DTMF was a
constant issue. My best suggestion for course of action is find another
provider.  NexVortex is pretty solid all around. They also had the quickest
recourse for when GNAPS went bottoms up last month and sent pretty much all
VoIP traffic in New England into a tailspin.


On Thu, Aug 26, 2010 at 3:23 PM, Andres <andres at telesip.net> wrote:

> On 8/26/2010 2:55 PM, M S wrote:
> > Hi,
> >
> > I've been getting complaints lately that callers to my IVR are
> > pressing a digit once but the system is responding as if they pressed
> > it twice (once for each of two consecutive menus).
> > I'm using an AGI script and logging all DTMF entries - and to the
> > script, at least, it looks like the digit is being pressed twice.  The
> > TN being called is a VOIP number (provided by Flowroute) and being
> > forwarded via SIP to my asterisk server.  The dtmfmode is set
> > to rfc28333 in sip.conf.
> >
> > The first time this happened, I figured the caller pressed the number
> > twice without realizing it.  It's happening to too many people for
> > that to be plausible anymore.  I also experienced it once myself,
> > months ago, when I entered my tn as 1234567890 and had it read back to
> > me as 1122334455.
> >
> > Can anyone give me some pointers where to start troubleshooting?  Can
> > overloading a system cause such an error?
> >
> > Thanks,
> I have seen this before.  Upon careful analisys we saw that the far end
> was sending the digits in RFC2833 plus SIP INFO (or Inband, I can't
> remember).  Thus Asterisk detected double digits.  The solution was to
> ask the remote end to only send RFC2833.
> Andres
> http://www.telesip.net
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