Yes, TTT, I kinda' skimmed over one issue.
New Cards, REPLACING OLD CARDS will not really be "SEEN" until a BOARD RENUMBER.
AND.... When you replace a card, with a different type, you have to (A) BROADCAST to the USERS (Intercom 799) that you are shutting the system down.
- - AND - -
(B) - you have to TELL THEM AGAIN TO GET OFF THE PHONES WHILE YOU DO THE BOARD RENUMBER....
My experience has been, once they see thier Phone "go live" (After you power up following adding the new card), the IMMEDIATELY jump back on the phones, thus, the BOARD RENUMBER is hampered while waiting on the system to become idle again.
I hate it when that happens....