that in Europe, and also in other parts of the world, there is a vast international telecommunication
network which (as well as national networks) has been established in conformity with the Recommendations of the CCI?T, particularly as far as the freque
ITU-T G.421-1988 history
1988ITU-T G.421-1988 Methods of Interconnection - International Analogue Carrier Systems (Study Group XV) 2 pp