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ITU-T D Supplement 2 Method for carrying out a cost price study by regional tariff groups
ITU-T E.401 Statistics for the international telephone service (number of circuits in operation and volume of traffic)
ITU-T E.413 International network management, Planning
ITU-T E.414 International network management, Organization
ITU-T E.420 Checking the quality of the international telephone service - General considerations
ITU-T E.421 Service quality observations on a statistical basis
ITU-T E.423 Observations on traffic set up by operators
ITU-T E.427 Collection and statistical analysis of special quality of service observation data for measurements of customer difficulties in the international automatic service
ITU-T E.507 Models for forecasting international traffic
ITU-T E.504 Traffic measurement administration
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