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ITU-T E.540 Overall grade of service of the international part of an international connection
ITU-T E.541 Overall grade of service for international connections (subscriber-to-subscriber)
ITU-T E.543 Grades of service in digital international telephone exchanges
ITU-T E.845 Connection accessibility objective for the international telephone service
ITU-T E.855 Connection integrity objective for the international telephone service
ITU-T E.880 Field data collection and evaluation on the performance of equipment, networks and services
ITU-T E.800 Supplement 2 Curves showing the relation between the traffic offered and the number of circuits
ITU-T E.800 Supplement 5 Teletraffic implications for international switching and operational procedures resulting from a failure of a transmission facility