- 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 mands- Detects touch tones as fast as 50 milliseconds- Postal lock input- Produces “Call Waiting” tones if the entry phone is activated when the house phones are already on a call- Add an entry phone to your standard home or office phones to provide door munication- Provide mercial or residential security via two-way handsfree munication at the door or gate- Connects in series with a single phone line or to a phone system's unused line input (loop start trunk input) VKC250