[asterisk-users] Callback through extensions.conf?

[Gilles]

On Sat, 05 Feb 2011 16:27:35 -0500, Paul Belanger
<pabelanger at digium.com> wrote:
>Easy enough.  I would suggest using Disa() for added security.

Thanks for the tip, but then, I would be charged for the call from my
cellphone to Asterisk. I guess it's not a big risk to assume a call
with my CID number is indeed from my cellphone, so I can just ring
Asterisk a couple of times before hanging up and being called back for
free.

A couple of articles on dialing out through an FXO port say that
Asterisk considers the call answered when it gets a dialtone, not when
the remote number goes off-hook. Has this been solved in Asterisk
1.4.20 + Zaptel  1.4.3-1? Are there work-arounds?

Thank you.