Frequentis AG develops and markets communication and information systems for safety-critical control centers in Europe, North America, Asia, Australia, South America, Middle East, Africa, and worldwide. It operates through two segments, Air Traffic Management (ATM) and Public Safety & Transport. The company offers air traffic management solutions, including voice communication, network, remote digital towers, ATC towers, surveillance, aeronautical information management (AIM), and aeronautical message handling systems (AMHS) solutions, as well as ATM/unmanned traffic management integration services. It also provides solutions for airports and airlines, and data management services; defense solutions comprising communications, networks, situational awareness, remote tower, military ATC, surveillance, and AIM; AMHS; emergency services, critical infrastructure, and public safety services; and operations communication, and incident and crisis management services. In addition, the company offers maritime systems consisting of search and rescue, coastal surveillance, and coastal radio, as well as port authority/vessel traffic systems; virtual maritime studio; and specialized communications systems, such as space and conference control systems, as well as professional services, including consulting, technical and user training, and technical support services. It serves civil and military air traffic control and aeronautical information management; and command and control centres for the police, fire brigade, emergency rescue services, coastguards, port authorities, and railways and local public transport systems. Frequentis AG was founded in 1947 and is headquartered in Vienna, Austria.