- Viking entry phone controller and call router- Allows single line telephones or a telephone system to share a phone line with a door entry phone- House phones ring with C.O. line cadence or distinctive ring when the entry phone is calling- Built in five number dialer- Detects busy or ring no answer and goes onto the next number- Built in door strike relay with 1 or 2 digit commands- Detects touch tones as fast as 50 milliseconds- Postal lock input- Produces Call Waiting tones if the entry phone is activa