ETSI TS 146 021-2001 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丢失帧的替代和消音.3GPP TS 46.021(版本4.0.0,第4次发布)
Digital Cellular Telecommunications System (Phase 2+); Half Rate Speech; Substitution and Muting of Lost Frames for Half Rate Speech Traffic Channels 3GPP TS 46.021 Version 4.0.0 Release 4