If you're looking to replicate the original install a little closer, you can use the OEM activation method, no phone call needed. Instead of the key from the bottom of the machine, Google up the OEM SLP key for your OEM. With that, plus the right certificate (must match the OEM you're installing on), you're activated instantly.
Behemoth - media server
Galactica - test lab server
Falling Outside the Normal Moral Constraints - MBP 15
Donnager - M4800 DTR
Rocinante - E5530 testing machine
Saratoga, Ticonderoga, BunkerHill - the Hydra desktop PC-thing.