ETSI TS 146 021-2007 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(版本7.0.0).3GPP TS 46.021(版本7.0.0,第7次发布)
Digital cellular telecommunications system (Phase 2+); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels V7.0.0;3GPP TS 46.021 version 7.0.0 Release 7