ETSI PRETS 300 972-1997 数字蜂窝通信系统(第2+阶段).半速率语音.半速率语音通信信道的不连续传输(DTX).第2版.GSM 06.41(版本5.1.0)
Digital Cellular Telecommunications System (Phase 2+); Half Rate Speech; Discontinuous Transmission (DTX) for Half Rate Speech Traffic Channels Second Edition; GSM 06.41 Version 5.1.0