[asterisk-dev] DTMF end accepted without begin

[John Aughey]

We actually get both the "wobble" detection (multiple tones detected with
one button press) and missing detection (press 201 and it detects 01 missing
the 2).  The suggestions on voip-info have not yet helped and the lack of
DTMF_BEGIN events concern me.  It's also not clear right now where the dtmf
detection is done, if it's in the zaptel-1.4.6 code base or within
asterisk-1.4.14/main/dsp.c.  They both seem to do tone detection.

John

On Dec 3, 2007 10:31 AM, Daniel Hazelbaker <daniel at highdesertchurch.com>
wrote:

> On Dec 2, 2007, at 5:35 PM, John Aughey wrote:
>
> > The begin frames (and associated end frames) are helpful to filter
> > out short dtmf reads.  There's even a #define which specifies the
> > minimum length of a dtmf tone.  One problem we're having is multiple
> > dtmf detections on a noisy cell phone connection, which should be
> > mostly filtered by knowing the begin and end time so that the length
> > can be properly measured and filtered if needed.
> >
> > John
>
> If you are running 1.4.15 (it should apply down to .12 as well I
> believe) then you can try this patch.  We have a similar problem at
> our site, except it is due to a junky NEC that is currently the front-
> end to the Telco.  Tones would have a drop-out in the middle of them
> so Asterisk was detected double digits.  i.e. they dial 235 and it
> reads 2335.  With this patch the "wobble" tones are almost never an
> issue anymore.
>
> <http://www.blueboxmoon.com/bitweaver/blogs/view_post.php?post_id=10>
>
> Daniel
>
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