Brad Huntting says:
>
> > Well, the biggest problem (apart from being unable to call from a
> > different location) is ensuring that you do indeed call the number
> > back... Tricks involve playing a recorded dial-tone back at the modem,
> > to fool it into thinking it has seized the line etc. You need to have
> > inbound and outbound lines, choosing one of the latter at random, or
> > perhaps using a digital exchange.
>
> As long as your outdial modem supports a "flash switch hook" option,
> just order 3 way calling on the line and always dial back with
>
> ATDT !W number
>
> The switch hook flash is an out of band signal to the switch that can
> be caught.
Far far more secure than this is just to order dial-out only lines for
your dialout and have seperate dial in and dial out lines. Thats what
we do. Since no one can ever dial in to the dial out lines you've just
eliminated a big potential security problem.
Perry
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