Someone has done it in the past, though I don't think it's working with 1.4:

http://voip-info.org/wiki/view/NVLineDetect
http://voip-info.org/wiki/view/NewmanTelOnAsterisk14
http://lists.digium.com/pipermail/asterisk-dev/attachments/20070522/8e89ad64/NVLineDetect0.9.1-0001.zip

On Thu, May 1, 2008 at 7:16 PM, Ian Darwin <[EMAIL PROTECTED]> wrote:
> Dave Donovan wrote:
>
>
> > It's likely that you already thought of this but I'll ask just in case.
> >
> > Is it the same access code for every call?  If so, have you considered
> just
> > making that part of the dial string?  That way when your users dialed a
> PSTN
> > number, the next thing they would hear is the ringing of their called
> party
> > and they wouldn't have to concern themselves with any of it.  It would be
> > just like the old Hayes Modem days of "ATDT *70,,4165551111" where commas
> > cause a pause in dialing.  In Asterisk I think it's a 'w' for a pause.
> >
> > When someone dials a pstn number, like 416-555-1111, you would acually
> dial:
> >
> > <gateway number>ww<access code>ww<4165551111>
> >
>
>  Thanks Dave. That is an option, and what I hope to do eventually, but it's
> been tried and found not to work with this setup. This was the subject of my
> mail a few weeks ago.  It's particularly galling that they ancient Hayes
> modem - closed-source, properietary, could (ahem) reliably detect secondary
> dialtone, whereas Asterisk, the gem of FOSS VOIP, has not capability
> whatsoever to actually detect secondary dialtone. It sounds like it should
> be a "simple" Application to write, but if it were that simple, somebody
> "woulda".
>
>  And, incorporating the dial string like that doesn't really solve the
> problem - once connected, people often have to deal with interactive
> DTMF-based systems, and they run into the same problem.
>
>  Cheers
>  Ian
>
>
>
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