Glad I could be of help.
As to where the code is, look in the System Options Form. In there you will see two options.
1) IP set registration (I think the Mitel default is ***)
2) IP set replacement (I think the Mitel default is ###)
You can change these codes to what ever you want. You definately need the first code for applications like Your Assistant, IP conferencing (VCON), 6510 Messaging Server. The second code comes in handy if you have a bad set and are doing a swap of hardware. Just unplug the first set, plug in the replacement set and wait for the enter PIN message, put in the replacement code with the ext DN and that's it, the new MAC is registered to the old extension DN. That is of course assuming that the replacement set is not registered already on the system as another DN(yes, I have had to explain that to some customers).
As for the numbers on the download to the set, I'm not sure. I have noticed that the numbers are different, but never dug deep enough to find out why.
Anyone else out there that knows????
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My Biggest problem is that I almost always believe what I tell myself.