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@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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_________________________________________________________________________
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