ES 203 038-2009
语音和多媒体传输质量(STQ);连接PSTN模拟接口时带有听筒的终端设备的要求和测试方法(V1.1.1)
Speech and multimedia Transmission Quality (STQ); Requirements and tests methods for terminal equipment incorporating a handset when connected to the analogue interface of the PSTN (V1.1.1)