Master control is the nerve center of the facility. The officer posted in this area is responsible for monitoring all safety and security systems; they control all of the doors, intercoms, cameras and utilities and can take control of all security computer systems whenever needed. They monitor all persons entering and exiting the facility and track all movement of visitors, detainees and staff. They make all emergency contacts with outside resources (ambulance, fire etc) and are the receiving point for all incoming calls and visitors.