[Freeswitch-users] Unreliable DTMF

[Jeff Pyle]

AT&T in the US is a classic offender.  For example, call their conferencing
service at 800-232-1234.  You've got to get through at least one level of
digit-pressing before the call actually connects.  Sometimes several.


- Jeff



On Thu, Sep 12, 2013 at 4:11 PM, Alex Lake <alex at digitalmail.com> wrote:

> Interesting! I always thought that pre-answer was B->A audio path only,
> and often didn't work on mobiles at all.
>
> On 12/09/2013 18:28, Michael Jerris wrote:
> > Depends on the carrier, FreeSWITCH itself has no issues with it..
> some/many carriers block it to avoid people running ivrs before answer to
> avoid toll charges.
> >
> >
> > On Sep 12, 2013, at 1:04 PM, Avi Marcus <avi at avimarcus.net> wrote:
> >
> >> Oh. I think it's written somewhere on the wiki that DTMF during
> pre_answer is unpredictable, it sometimes works and sometimes doesn't...
> >> -Avi
> >
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