Telephone apparatus BC 314 for AT systems, with additional apparatus connection. Two BC 314 are used in pairs connected to each of their main lines and interconnected by two wires. Table model with a cover of black lacquered sheet, a microphone of bakelite model 50, a 3-way switch, a blender, a fingerboard of nickel-plated brass, a respringing pressure switch on the top of the cap, a clock, an inductor with a crank for signalling to the connecting devices and a wall plate with a built-in ring bell and a clutch field for connecting an additional ring bell.