DSNA awarded Frequentis and CS GROUP a 20-year contract to provide a main and back-up IP-based radio/telephone Voice Communication System for 14 main air traffic control approach and tower control centres. CS GROUP is the consortium representative for the major project and Frequentis is co-contractor. DSNA provides air navigation services for nine French mainland regional and several overseas centres in charge of ATC approach and tower control. The VCS system will be deployed to 14 sites located in metropolitan France (including Bordeaux, Montpellier, Nantes, Nice, Paris Orly, Strasbourg among others) and some French oversea territories. Bordeaux will be the first centre to be equipped. Frequentis will supply its market leading VCS3020X for the main VCS while CS GROUP will supply its innovative solution, CSoIP (Communication and Security over IP), for the back-up VCS. Both IP-based integrated secured VCS solutions are compliant with EUROCAE ED 137 standard. The main and back-up VCS will use the new full IP transmitters/receivers deployed in France. The scope of the contract includes the design, supply and maintenance, with a unique functionality that enables the controller to transparently operate the same frequencies and radio channels in main and back-up mode.