Martin, it appears your going to get plenty of help on this. Crabb had a very good question for you in asking if this was for internet access. The fact that you have an XP machine is not relevant. The cisco programs through your browser. I personally use 3-com for simple internet to network integration. way cheaper! You need both SPID numbers, you need the dial-up number for your internet provider presuming the provider supports ISDN, username and password from your provider, primary and secondary DNS. If the cisco is smart, it will detect the type of switch (co), If not you'll have to get that info. If this is a simple network leave DHCP enabled on the cisco and leave NAT enabled. Reboot everything and log on. It really is easier that you think. Remember you're a phoneman and we can do everything! Right Guys?