multiple remote desktops behind nat router

hey

i've posted before... but i don't believe i've asked the right question. let me explain.

i have a cisco 1720 router. it is nat-based and it currently is setup as part of a router-to-router vpn with our home office. i have five xp pro machines behind this. (ips: 128.5.0.x) remote desktop can be setup on each machine... no problem. i need to setup the router to allow all five users to connect to their respective remote desktops at any time. i gather the default port used by rd is udp 3389. i believe i need to open more ports though. how would i setup rd to use these other ports with their respective machine?

thanks.

sorry i didnt see your post, i started a new thread because i figured out how to tweak the xp terminal server settings today. i posted it here Changing terminal server port

hope it helps you out.