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ITU-T E.202 Network operational principles for future public mobile systems and services
ITU-T E.426 General guide to the percentage of effective attempts which should be observed for international telephone calls
ITU-T E.820 Call models for serveability and service integrity performance
ITU-T E.810 Framework of the recommendations on the serveability performance and service integrity for telecommunication services
ITU-T E.830 Models for the specification, evaluation and allocation of serveability and service integrity
ITU-T E.850 Connection retainability objective for the international telephone service