The link is a port test to see if port 6346 (the default Gnutella port) is open or not. If you can't reach that test page, it means the port is blocked. If so, it will either be due to your connection device's internal NAT firewall or else your ISP is blocking this port. A very minor chance the reason is your software firewall.

To my knowledge, BT voyagers are best port forwarded. Instructions Port Forwarding for the BT Voyager 2091 (the same instructions as yours) (click on link). Don't forget to save settings, reboot device if it's required, & restart LW. Step 1 of setting up a static ip is the most important step.

Also ensure you set up your XP firewall properly; Firewall configuration instructions (click on link)