The Model 1816 Telephone Intercom System is a unique communication and access control device that provides two-way voice communication and control of a main entry door through the resident's own telephone without the need of a dedicated Central Office (C.O.) phone line. This capability eliminates the need for costly hard-wired intercom systems, monthly line charges and equipment lease payments. The 1816 also provides communication and control of the door even if the resident does not have central office phone service. The 1816 is ideal for colleges wishing to control access into student Resident Halls, apartment buildings and office buildings.