[Asterisk-Users] dtmfmode=inband with G.729

[Juan Cardenas]

I have problems with talk off at times.. my wife, just can't stop her.
(sorry non asterisk related joke)


----- Original Message ----- 
From: "Steven Critchfield" <critch at basesys.com>
To: <asterisk-users at lists.digium.com>
Sent: Friday, April 02, 2004 12:24 PM
Subject: Re: [Asterisk-Users] dtmfmode=inband with G.729


> On Fri, 2004-04-02 at 10:12, Jim Rosenberg wrote:
> > On Fri, Apr 02, 2004 at 08:52:09AM -0600, Eric Wieling wrote:
> > > It's not asterisk, its the codecs.  Codecs other than ulaw and alaw
will
> > > distort continuous tones like DTMF.
> >
> > Welllllllllll ...
> >
> > At work we experience this with Cisco dial-peers over G.729: DTMF is
> > erratic. But it's *NOT* inoperable. The way Asterisk does this, it
> > doesn't even *try* to send the data through. I'd sure like that option,
> > even if it might not register at the other end.
> >
> > My Cisco-dial-peer-only connection users tell me that they often have to
> > try a second time, but DTMF does usually work for them eventually.
> >
> > "Might not resgister" does beat "Refuse to try" ...
>
> No this is not better. If you allow the tones to be too relaxed you will
> trigger them with certain peoples voices. This is known as talk off. We
> as a group do not want talk off. In fact we should strive to avoid it as
> it is considered a better to not have any talk off.
>
> > If you have an actual IVR application where errors matter, then of
> > course you might decide you wouldn't want the risk of distored DTMF, but
for
> > simple things like picking an extension on a PBX where the consequence
> > of an error is just a wrong number, why not give it a go?
> >
> > Anyone who chooses dtmfmode=inband is knowingly choosing an option that
> > is inherently error-prone.
>
>
> -- 
> Steven Critchfield  <critch at basesys.com>
>
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