ETSI TS 129 163-2007 数字蜂窝通信系统(第2+阶段).全球移动通信系统(UMTS).IP多媒体(IM)核心网(CN)子系统和电路交换(CS)网间的互通(版本7.7.0).3GPP TS 29.163(版本7.7.0,第7次发布)
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Interworking between the IP Multimedia (IM) Core Network (CN) subsystem and Circuit Switched (CS) networks V7.7.0; 3GPP TS 29.163 version 7.7.0 Rele