Single Entry Phone Controller with call forwarding and 5 amp door strike control. The C-250 allows single line telephones or a telephone system to share a phone line with a single Viking entry phone. Tenants may answer an entry phone call, converse with the visitor and let them in with a touch tone command. The C-250 also has a built in five number dialer to make an outside call if there is no answer on the inside phone. If the outside call is busy or ring no answer, the C-250 can call up to four more numbers. The C-250 provides a Call Waiting tone when the phone line is in use. Tenants may also call out to the entry phone for monitoring purposes. Applications Add an entry phone to your standard home or office phones to provide door communication Provide commercial or residential security via two-way handsfree communication 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) Features 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 activated when the house phones are already on a call Compatible with these Viking entry phones: - Works with any E Series or K Series of Viking Phones - Or use with any analog phone