You would need to look at the programming. What trunking are they using? Are they using CAP key, lines keys or loop? Are they restricted? Hit Feature 3 on any phone and get the hardware code. NTAC should have that info for the installing company. Don't know if they will help a non SV9100 certified tech though. A LOT of nursing homes were put in by nationals. There has to be documentation or a bill they can trace back to. If you have a database backup you can get the password from that. Otherwise you can try some of passwords. Chances are they are all changed.