Frequentis AG engages in developing, marketing and supplying communication and information systems for control centers with safety-critical tasks. It operates through the Air Traffic Management and Public Safety and Transport segments. The Air Traffic Management (ATM) segment serves civil and military air traffic control and homeland security organizations. The Public Safety and Transport (PST) segment comprises public safety (police, fire, and emergency rescue services), public transport (railways), and maritime (coast guard, port operators, and organizations that monitor shipping on inland waterways). The company was founded on July 1, 1947 and is headquartered in Vienna, Austria.