[Asterisk-Users] Can Asterisk do the following for me ?

[asterisk at top-consulting.net]

Hey guys, I am aware that Asterisk may be a bit overkill for what I need but I
haven't found any other software. Here's what I need to do:

I have 1 computer with 2 modems in it. Each modem (regular 56k )is plugged into
a different phone line ( line A and line B ).

Whenever a call comes on line A, a software application should automatically
dial a fixed number on line B and form a connection between the two ends.

In other words:

call comes into modem, software dials a fixed number on second line, makes the
connection and it works as if the caller dialed the end number.

Why do I need this ? I currently use Vonage in an European country so that my
North American friends can call me localy. The problem is that this North
American phone number is only available at home and not when I'm outside,
travelling, etc.

Using call forwarding would require me to set up Vonage to forward calls to an
international number and thus it will cost me extra! But, if I can manage to
get the incoming Vonage call into a computer, then have the computer dial my
local cell phone number and patch the incoming call I would have access to
incoming North American calls everywhere and much cheaper too!

Notice I only want this to happen one way, in the direction I described and not
the other way around!

So..does anyone know if Asterisk can do this, or another ( simpler ) software ?
Also, would it work with regular 56k modems ?

P.S. Only a voice call would come into Asterisk, no VoIP stuff and only voice
should go out ( transit the system )