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

[Nir Simionovich]

Hi Matt,

  Thanks, appreciate the info.

Nir S

On Sun, Jun 28, 2009 at 5:01 PM, Matt Florell <astmattf at gmail.com> wrote:

> 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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