Call module for call initiation with individual bed identification for connection to an electronic module or room terminal with bed databus. Mobile call units, such as pear and multiple push-buttons, are connected to the 7-pin plugs. Additional 6-pin plugs for connecting a medical unit (e.g. Infusiomat infusion pump) with alarm contact. Connection of up to 8 call modules with wire-saving technology to the bed databus is possible. Identification display (up to 8 digits, freely configurable) on call initiation. Monitoring of connected call units (call circuit monitoring).