We have an old NEAX 1400 IMS switch at a hotel here in Las Vegas, customer inherited it when they bought hotel in Feb. Just experienced power outage & lost greeting, now greeting just says "Hello". You can dial to extensions during this pause or just stay on line & will dial operator who can then direct your call. Need to know how to change greeting, get into mailbox or whatever it is. Have absolutely no documentation. Any help will be immensely appreciated. We want to get rid of this switch eventually & sell them a hotel/motel package, any suggestions? Thanks in advance. Craig (aka humpdadog).