[asterisk-dev] Can Asterisk detect A,B,C,D DTMF signals

[Matt Florell]

Hello,

One of our clients uses "A" quite a bit internally, the Zoiper
softphone has it right in the key-pad, and they use it for internal
extensions like voicemail and timeclock applications through Asterisk.
As for the others, I have heard of success with B and C, but some
issues with the D key in Asterisk.

As a side note, these DTMF signals have been around for decades, most
telco infrastructure equipment supports these signals, and you can
find very old linesman's handsets that have the A-D row of buttons on
them.

http://en.wikipedia.org/wiki/Dtmf#.23.2C_.2A.2C_A.2C_B.2C_C.2C_and_D

MATT---

On 6/28/09, Nir Simionovich <nir.simionovich at gmail.com> wrote:
> Hi All,
>
> I've been asked by a prospect if Asterisk can handle the additional DTMF
> signals that
> may be produced by some emergency systems. According to the DTMF standard,
> there are 4 additional tones that can be generated, however, these are not
> used in most
>  phones.
>
> Can these be intercepted by Asterisk?
>
> Nir Simionovich
>
>
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