ETSI TS 123 509-2007 数字蜂窝通信系统(第2+阶段).全球移动通信系统(UMTS).电信和互联网融合业务及高级网络协议(TISPAN).支持公民与当局在紧急情况下通信的NGN架构
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Telecommunications and Internet converged Services and Protocols for Advanced Networking (TISPAN); NGN Architecture to support emergency communicatio