ETSI TR 122 979-2009 数字蜂窝通信系统(第2+阶段).全球移动通信系统(UMTS).长期演进技术.组合电路交换(CS)呼叫和IP多媒体子系统(IMS)通话的可行性研究(版本8.0.0).3GPP TR 22.979(版本8.0.0,第8次发布)
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Feasibility study on combined Circuit Switched (CS) calls and IP Multimedia Subsystem (IMS) sessions V8.0.0; 3GPP TR 22.979 version 8.0.0 Relea