ETSI ES 202 020-2007 语音处理,传输和质量方面(STQ).基于IP网络的语音网关衰减及电平规划的协调泛欧/北美方法(版本1.4.2).包括磁盘
Speech Processing, Transmission and Quality Aspects (STQ); Harmonized Pan-European/North-American approach to loss and level planning for voice gateways to IP based networks (V1.4.2; Includes Diskette)