The CCN/CSI (Common Communication Network/Common System Interface) provides a communication infrastructure to DG TAXUD and all customs and/or taxation administrations, for supporting all applications in the sector of Customs and Taxation. DG TAXUD has implemented CCN2, a new interoperability infrastructure to support service oriented architecture and to ensure location independent access to services and services that are backwards compatible with existing customs systems. CCN/CSI is closed secured network, consisted of a series of physical computers – the "gateways“. The CCN/CSI is built in the way that all National Administrations use a harmonized method of access to the European Commission and every National Administration systems and the exchange of information among National Administrations is facilitated. CCN 2 is an evolution of the current CCN architecture and services, which will provide a full set of value-added services to support the evolution to new application developments. CCN2 will be delivered in several releases in order to minimise risks. The first release is focused on enabling SOA and security and is in operation since October 2017.