The invention relates to a communication system for an air control center, comprising a first public communication channel, a second secure communication channel, at least one voice communication device for exchanging voice data on each of the two communication channels, at least one management station comprising a control interface and a display interface and designed to manage the voice data exchanges and to control the branching of the voice data into each of the two communication channels, a first stand-alone processing module and a second stand-alone processing module for generating a display in a secure manner on said display interface.