The invention relates to telecommunications and network security. The invention relates more particularly to a firewall system for securing a business autocommutator (200) which is connected to at least one communication network in a commuted mode, type PSTN, and to at least one set of communication peripherals and/or application servers (210), said system comprising a communication analyzer (100) of low levels (1- ) of the OSI model of digital communications in a circuit and analog mode, and a firewall server (110) which is connected to the analyzer (100). The invention is characterized in that the system also comprises a supervision server (120) connected to the run-of-river output (199) of the autocommutator (200) for analysis of communication tickets and application of security rules relating to the high applicative layers (4 - 7) of the OSI model.
展开▼
