This system suits medium and large sized vessel switch wards and as the most efficient tool for the sick to call for the doctor on duty, it is consisted with calling buttons installed beside the bed, controller installed in the doctor's office and the other alarms installed in other places. When press the calling button, the controller output alarm signal and at same time, the out-connected alarms also output signals. In the controlling panel, there are calling indicators, calling position indicator, and the mute key etc.