Mind you the IPs themselves don't help, I recently upgraded my BT account to include VOIP. BT sent me a new Router that I could plug the VOIP phone into.
Reading the manual there is no mention of WPA at all, it suggests that for encryption you should enter the serial number of the router into the WEP encryption box (it's about 10 digits long) .
I had to dig about in the routers set up to find the WPA section.