Frequentis now powers more than 800 main air traffic controller working positions and 700 emergency positions throughout Germany.
German air navigation service provider DFS needed technology for the centre that could quickly and easily adapt to changing air traffic management needs.
Reviewing the successful completion of the project, Klauspeter Hauf, responsible for operational voice systems at DFS, said: "The Frequentis team has again demonstrated its professionalism and ability to come up with excellent solutions to our particular needs.
"Constant availability and flawless communication are vitally important in such a safety-critical environment."