I would think a fairly simple access list of two lines would do here. Essentially you want a line that will deny traffic that has the dial pool as source address and has the dial pool as the destination address and you want a line that will permit everything else.
The syntax would look like this:
access-list 150 deny ip
access-list 150 permit ip any any
This access list would be assigned as an outbound filter on the dialer or async interface.
The syntax for your particular situation will get convoluted and complex because the range of addresses in your dial pool is not assigned on a bit boundary. So it would take multiple statements to define the range starting at 100 and extending to 200. If the dial pool were on a bit boundary, starting at 128 and going to 191 for example, the access list might look like:
access-list 150 deny ip 10.92.1.128 0.0.0.63 10.92.1.128 0.0.0.63
access-list 150 permit ip any any
HTH
Rick