[asterisk-users] How to change outgoing DTMF frequencies on zaptel?

[Zeeshan Zakaria]

Hi,

I am generating the tones from Asterisk, using senddtmf and option D in the
Dial command.

Is there no way to change it? Can I somehow modify it in tonezone.c and
recompile Asterisk?

--
Zeeshan A Zakaria

On Sat, Nov 21, 2009 at 8:56 AM, Tilghman Lesher <tlesher at digium.com> wrote:

> On Friday 20 November 2009 17:03:20 Zeeshan Zakaria wrote:
> > Hi,
> >
> > I am having this issue that with one of the Asterisk servers, on zaptel
> > hardware, that DTMF tones are 10-30 Hz too high than the upper limit for
> > any DTMF digit frequency. This is causing problem with the equipment on
> the
> > other end which is trying to recognize the DTMF digits. I tried different
> > cards from the same vendor but it didn't help. For example for digit 1
> > where it should generate 697 Hz, it would generate 712 Hz, and where it
> > should generate 1209 Hz, it would generate 1230 Hz.
> >
> > Talking to the hardware support, they said it is not dependent on the
> > hardware. I googled and found very little information, but apparently it
> > was an issue with ztcfg and zaptel, but it was fixed more than a year
> ago.
> >
> > I found that in dsp.c file we could change the frequencies, but that is
> > only for the incoming DTMF.
> >
> > Is there a way to change DTMF frequencies for the outgoing DTMF? If I
> could
> > drop all the frequencies by 15 Hz, that might solve the problem which I
> am
> > having.
>
> It's hardcoded in tonezone.c.  Another possibility is that your phones are
> generating tones that are out of whack with the standard, and Asterisk
> isn't
> detecting them as tones because they're so out of whack and they're simply
> getting passed, unchanged, onto the remote side, where they are similarly
> not
> being detected.
>
> --
> Tilghman Lesher
> Digium, Inc. | Senior Software Developer
> twitter: Corydon76 | IRC: Corydon76-dig (Freenode)
> Check us out at: www.digium.com & www.asterisk.org
>
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