The Viking 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.