ITU-T Recommendation E.436 Series E: Overall network operation, telephone service, service operation and human… Network management – Checking the quality of the international telephone service. Customer Affecting Incidents and blocking Defects Per Million

CCITT Recommendation E.434 Telephone network and ISDN. Quality of service, network management and traffic engineering. Subscriber-to-subscriber measurement of public switched telephone network CCITT Recommendation E.433 Telephone network and ISDN. Quality of service, network management and traffic engineering. Billing integrity CCITT Recommendation E.432 Telephone network and ISDN. Quality of service, network management and traffic engineering. Connection quality ITU-T Recommendation E.437 Series E: Overall network operation, telephone service, service operation and human… Network management – Checking the quality of the international telephone service. Comparative metrics for network performance management ITU-T Recommendation E.438 Series E: Overall network operation, telephone service, service operation and human factors… Performance parameters and measurement methods to assess N- ISDN 64 kbit/s circuit-switched bearer service UDI in operation ITU-T Recommendation E.439 Series E: Overall network operation, telephone service, service operation and human factors. Quality of service, network … Test call measurement to assess N- ISDN 64 kbit/s circuit-switched bearer service UDI in operation