ISA/Cisco question

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I have a network consisting of a corporate office and a remote office,
currently with a 1721 cisco router at either end. The corporate office
has a t1 connection to the internet, and there is a t1 point to point
connection between the offices. We are in the process of setting up an
ISA server to sit in the corporate office, (win2000 server/isa 2004).
Currently the only configuration I can do with this without purchasing
additional hardware is to place this behind the 1721 router in the
corporate office. This would mean that our remote office is an
external network. Am I capable of taking advantage of the system's
monitoring/firewall capabilities this way using the isa server as a
proxy? We have an exchange server/file server on the internal network.
If I had to setup another isa server in the remote office would I be
able to route through to those servers still?

Would it be simpler to get another 1721 box, take one of the dsu/csu
wics out of the corporate office's router, slap it in the new one,
place it on the outside of the network, and place the one going to our
remote office on the inside?

Thanks so much,

Bill

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