It's been a while.....
1/ Log onto the 3300 controller. Go to the "remote busy lamp" form. Review and add any missing office extensions.
(The 5550 IP console obtains extension data from this form).
2/ Next, restart the console application. This will force a re-sync of extension data from the controller,
but does not update the BLF list with new extensions just yet.
3/ From the console application, select a sub-menu option to edit / create BLF lists.
(I can't recall exactly which main menu item to select).
An editing window appears, listing extensions read from the controller.
The window provides tools to create, edit and customise BLF list(s).