ETSI TS 123 172-2002 全球移动通信系统(UMTS);电路交换(CS)多媒体业务的技术实现;UDI/RDI回落和业务修正;进程2(3GPP TS 23.172 版本 5.0.0 发布5)
Universal Mobile Telecommunications System (UMTS); Technical Realization of Circuit Switched (CS) Multimedia Service; UDI/RDI Fallback and Service Modification; Stage 2 3GPP TS 23.172 Version 5.0.0 Release 5