ETSI TS 123 172-2009 全球移动通信系统(UMTS).长期演进技术.电路交换(CS)多媒体业务的技术实现.UDI/RDI退却和业务修正.第2阶段(版本8.0.0).3GPP TS 23.172(版本8.0.0,第8次发布)
Universal Mobile Telecommunications System (UMTS); LTE; Technical realization of Circuit Switched (CS) multimedia service; UDI/RDI fallback and service modification; Stage 2 V8.0.0; 3GPP TS 23.172 version 8.0.0 Release 8