cloud200 : Welcome to the board !!!
The number of intercom keys are part of the ADMIN programming. Except for a button being stuck, if you do the F*0 and find 3 I/C buttons, it is programmed for 3. As long as that is programmed as an intercom, you cannot program anything else on that button.
You need to get a Nortel tech that knows how to remove one I/C from the phone in question.
Once removed - it can then be programmed as a feature, internal, or external auto dial.
