Call module for call activation with individual bed code for connection to an electronic module or room terminal with bed bus. Movable call units, such as handheld switches and multiple buttons are connected to the plug-in contacts (7-pole). Connection of up to 8 call modules possible in wire-saving technology to the bed bus. Display of the code (up to 8 digits, freely configurable) for call activation. Monitoring of connected call units (call group monitoring).