The Viking C-200 Single Entry Phone Controller allows a single line phone or phone system to share a phone line with an entry phone. Tenants may answer an entry phone call and converse with the visitor. The C-200 provides a "Call Waiting" tone when the phone line is in use. Tenants may call out to the entry phone for monitoring purposes. Auxiliary contacts are provided to operate a doorbell or activate a camera, lights, etc. If additional features (such as door strike, multiple entry phone with caller ID and keyless entry) are needed, use the Viking model C-2000A.