ETSI TR 123 977-2007 全球移动通信系统(UMTS).宽带和资源节约(BARS)以及电路交换(CS)网的语音增强(版本7.0.0).3GPP TR 23.977(版本7.0.0,第7次发布)
Universal Mobile Telecommunications System (UMTS); Bandwidth And Resource Savings (BARS) and speech enhancements for Circuit Switched (CS) networks V7.0.0; 3GPP TR 23.977 version 7.0.0 Release 7