The new system, which will cost £1.5 million to install and which will pay for itself in three years, replaces the different systems used by the various departments.
Phone numbers for departments based at Cyril Le Marquand House will change when the system – installed jointly by Jersey Telecom and 3Com – comes on line on 6 March.
The chief executive to the Council of Ministers, Bill Ogley, said that the move was part of modernising the way in which the States worked.
