Telephone apparatus BC 311 for an AT system, an intermediate station, 2 dl, with a connection. Table model with black lacquered plate cover, microphone of bakelite model m33, fingerboard of nickel-plated brass, 3-way reverser, resilient pressure reverser, blender, apparatus bell, inductor with crank and wall plint with ring bell. The respringing push button on the top of the apparatus has a dual function - when signaling with the crank inductor, the own apparatus bell is silenced and during a conversation the microphone can be temporarily short-circuited to improve the audibility of the earphone when listening.