ETSI TS 146 021-2017 数字蜂窝通信系统(第2+阶段)(GSM全球移动通信系统);半速率语音;半速率语音业务信道丢失帧的替换和静音(V14.0.0;3GPP TS 46.021,版本14.0.0 发行版本14)
Digital cellular telecommunications system (Phase 2+) (GSM); Half rate speech; Substitution and muting of lost frames for half rate speech traffic channels (V14.0.0; 3GPP TS 46.021 version 14.0.0 Release 14)