ITU-T E.491-1997
目标话务测量 服务质量,网络管理和通信工程 通信工程 测量和通信纪录 E系列:全面网络操作,电话服务
Traffic Measurement by Destination Quality of Service Network Management and Traffic Engineering - Traffic Engineering - Measurement and Recording of Traffic - Series E: Overall Network Operation Telephone Service Service Operation and Human Factors Study