Wilson,
I've not really toyed with hot desking too much but I am familiar with Phantom, I briefly reviewed the F1 help documentation while I was in my DB programming and gather it's similar to a phantom... kind of and that you'll either need to add a feature key to the keymap to allow hot desking users to log onto hot desk enabled phones. A big note to look at though is whether or not your system is licensed for this which you can check by going to "Software License" at the top of the tree in the left hand pane of db programming, in my case I am not hot desk enabled.
You can pull up the same help file I did by hitting F1 while in DB programming and do a search for "Hot Desking" and you should find the same help section I did. Sorry i can't offer more help!