Here is how I have it wired up: Virginmedia cable modem <-> SPA2102 <-> Wireless router, with a phone in the Phone 1 socket.
I have folled the "quick install" instructions and these links: viewtopic.php?f=29&t=3828
I can still access the net, and I have 3 steady green lights on my adapter (on, internet and phone 1) whbich I guess is good. But I have no dialing tone on the phone and it does not ring when I dial it. Oh, and my Voipfone account definetely works as I have been usign a softphone.
One thing I am not sure about is whether I need to set "Enable MAC Clone Service" to yes. I have experimented a bit with this, but it did not help. If I do need it, I am not even sure what MAC address I should use - the one in my wireless router does not seem to be related to any computer I use now.