[Asterisk-Users] new DTMF tones

[Mark Spencer]

the "m" and "u" are "pseudo tones" that never pass up beyond the channel
driver they represent "mute" and "unmute" so that when a tone is detected,
if the channel is in a conference, it can be muted from that conference in
order to confirm a tone was actually present on the line and not simply
the echo of another line.

Mark

On Thu, 22 May 2003, John Harragin wrote:

> DTMF is a standard for a 4X4 array. Each key simultaniously plays two of 8
> frequencys  one of the 4 frequencies assigned to the 1, 4, 7 or * row and
> one from the 4 different frequencies assigned to  1, 2, 3 or does_not_exist
> column. Do you have extra buttons on your phone (Do any manufacturers use
> the extra tones)?
>
> John
>
> ----- Original Message -----
> From: "Jim Gottlieb"
>
>
> > I just loaded from CVS this afternoon and in the debug output I see...
> >
> > DEBUG[76820]: File chan_zap.c, Line 3254 (zt_read): DTMF digit: m on
> Zap/16-1
> > DEBUG[76820]: File chan_zap.c, Line 3254 (zt_read): DTMF digit: u on
> Zap/16-1
> >
> > I knew about DTMF 0-9, A-D, *, and #, but I didn't know about m and u :-).
>
>
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