ETSI ES 202 739-2017 语音和多媒体传输质量(STQ);从用户反馈的QoS角度对宽带VoIP终端(手机听筒和耳机)的传输要求(V1.5.1)
Speech and multimedia Transmission Quality (STQ); Transmission requirements for wideband VoIP terminals (handset and headset) from a QoS perspective as perceived by the user (V1.7.1)