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ITU-T M.600 Organization of routine maintenance measurements on circuits
ITU-T M.605 Routine maintenance schedule for international public telephony circuits
ITU-T M.650 Routine line measurements to be made on the line repeaters of audio-frequency sections or circuits
ITU-T M.660 Periodical in-station tests of echo suppressors complying with Recommendations G.161 and G.164
ITU-T M.710 General maintenance organization for the international automatic and semi-automatic telephone service
ITU-T M.675 Lining up and maintaining international demand assignment circuits (SPADE)