I don't know what is it like now but before ours was never connected to a phone line and we always got the PPV so i doubt the phone line is of importance but that was a long time ago.
peoples IPs change every day so i doubt the IP is importance. My IP changes multiple times a week, dont think sky would make so much trouble for themselves especially since most people buy the PPV event days before as it is cheaper or at least it was.
Just dont plug out the card and put it into another box as that will cause issues.