SAMU is an international organization that coordinates medical emergency services through call centers that regulate needs and dispatch ambulances and mobile intensive care units. SAMU centers are responsible for medical regulation and telemedicine during individual medical emergencies and mass casualty events. The French SAMU network is divided into three levels - department, region, and national - to efficiently respond to emergencies across the country. SAMU works with hospitals, civil defense, and other groups to form an integrated emergency medical system capable of handling daily emergencies as well as large-scale disasters.