Switches between CO line and House Line, with call buttons for Building Manager and Janitor plus a button to remotely open the front door.  Also may be used with phones other than the 553.  Contributed by Chuck Hensley, Bill Bentsen and Tom Adams.

Wall Telephone (Hotel) Sets, 293A Sidetone Subscriber Set (Manual Only). Drawing provided by Don Woodbury and cleaned up by Steph Kerman.

Wall Telephone (Hotel) Sets, 293A Sidetone Subscriber Set (Manual Only) Alternate Drawing.

Wall Telephone (Hotel) Sets, 293Y Sidetone Subscriber Set Local Battery Talking.

Wall Telephone (Hotel) Sets, 333B Sidetone Subscriber Set (Manual Only).

Wall Telephone (Hotel) Sets, 553 BA, 553A or 533A Sidetone Subscriber Sets (Manual or Dial).

Wall Telephone (Hotel) Sets, 653A, 653BA, 433B, 633A or 633BA Anti-Sidetone Subscriber Sets (Manual or Dial).

Wall Telephone (Hotel) Sets, 653A, 653BA, 433B, 633A or 633BA Anti-Sidetone Subscriber Sets (Dial only). Drawing simplified by Bobby Koch to show dial only configuration.

Wall Telephone (Hotel) Sets, 653 Anti-Sidetone Subscriber Sets (Dial only) Color Version. Colorized version prepared by Vin DiJohn.