The old "Y" "A" screens. so easy to program and flexible as hell. IT could translate to any extension, group, outside line, ID number etc. I don't really see anything as robust as this screen in the newer systems, and it was designed over 25 years ago.
That and the "C" screen, one of the most intuitive troubleshooting tools ever created. The newer manufacturers should be as inventive as executone was. Too bad it had "shi--y management, the product was the best!
Tj