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ITU-T M.820 Periodicity of routine tests on international voice-frequency telegraph links
ITU-T M.830 Routine measurements to be made on international voice-frequency telegraph links
ITU-T M.850 International time division multiplex (TDM) telegraph systems
ITU-T M.900 Use of leased group and supergroup links for wide-spectrum signal transmission (data, facsimile, etc.)
ITU-T M.880 International phototelegraph transmission
ITU-T M.1010 Constitution and nomenclature of international leased circuits
ITU-T M.910 Setting up and lining up an international leased group link for wide-spectrum signal transmission
ITU-T M.1012 Circuit control station for leased and special circuits
ITU-T M.1014 Transmission maintenance point (international line) (TMP-IL)
ITU-T M.1013 Sub-control station for leased and special circuits
ITU-T M.1015 Types of transmission on leased circuits
ITU-T M.1030 Characteristics of ordinary quality international leased circuits forming part of private switched telephone networks