Does anyone happen to use this kind of phone (Attatched Image)?

If you do, and you happen to know how to do the functions on it or have a booklet for it or happen to know where I can get the information on it, please let me know.

We use them here at work (I know, they are ancient phones), and someone screwed one up and now it won't automatically pickup a line that calls in or hang up a line. When I go to hang up the intercom or the line, it stays connected on speaker phone and people can hear what I am saying.

So, if anyone happens to use these or knows anything about programming them, please contact me and help me out.