I'm looking for ideas on the best way to prevent un-authorized use of our PBX while our hotel is closed during the winter time. I don't want to change the COR's on all the stations and then change it back again in six months. I can't shut the system down completely, it needs to forward incoming calls to another location, and there a handful of stations that do need to keep working. One thought was to physically remove the line cards that aren't going to be used, but I don't know if that can be done with out removing associated programming. Any suggestions?