本文件确定了影响语音传输质量的网络设计和技术选择的趋势，预计将导致呼叫者体验到更广泛的质量水平。该文件审查了国际电联对通话质量类别定义的影响，并确定了需要管理的主要损害因素，以便提供规定的质量水平。本文件探讨了在互联网络之间交换信息的选项，并通过指定有关单个呼叫的质量参数信息交换的Stage1类型描述来总结。

This document identifies trends in the design of networks and choices of technology that affect speech transmission quality and are expected to lead to a wider range of quality levels that will be experienced by callers. The document reviews the implications of the ITU definitions of call quality categories and identifies the main impairment factors that need to be managed in order to provide specified levels of quality. The document explores the options for exchanging information between interconnected networks and concludes by specifying a Stage1 type of description for the exchange of quality parameter information about individual calls.