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ITU-T M.660 Periodical in-station tests of echo suppressors complying with Recommendations G.161 and G.164
ITU-T M.670 Maintenance of a circuit fitted with a compandor
ITU-T M.675 Lining up and maintaining international demand assignment circuits (SPADE)
ITU-T M.710 General maintenance organization for the international automatic and semi-automatic telephone service
ITU-T M.719 Testing point (switching and interregister signalling)
ITU-T M.721 System availability information point