ETSI TS 129 231-2009 数字蜂窝通信系统(第2+阶段).全球移动通信系统(UMTS).电路交换(CS)核心网架构对SIP-I协议的应用.第3阶段(版本8.2.0).3GPP TS29.231(版本8.2.0,第8次发布)
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Application of SIP-I Protocols to Circuit Switched (CS) core network architecture; Stage 3 V8.2.0; 3GPP TS 29.231 version 8.2.0 Release 8