Completely pre-assembled apartment station AP. This allows for quick and clean installation. Design variety through integration into the switch program, ensuring a uniform appearance of door communication and electrical installation. Installation can be done with or without a cover frame. Easy installation through plug-in screw terminals on the mounting plate. The connection to the apartment station is made when the apartment station is plugged onto the mounting plate. Simple disassembly of the apartment station during renovation work. Mounting holes for installation. Signal transmission and power supply to the apartment station via a polarity-safe and short-circuit-proof 2-wire bus. Parallel connection of up to three apartment stations is possible. One-person commissioning through a simple commissioning procedure. Distinction of ringing tones between door call, internal call, and floor call. Selection of five different ringing melodies, which can be individually assigned to the respective call buttons. Hands-free function with voice-controlled intercom and echo as well as background noise suppression. Override function in loud ambient noise during the conversation. Listening lock. Control buttons with integrated LEDs for status indication. The control buttons of the apartment station AP manage the following functions in conjunction with the switch actuator or the flush-mounted switch actuator: switching lights and other functions, operating the door opener, setting the ringing melody, turning the ringing on and off, accepting calls, activating the override function, and adjusting ringing and speaking volume.