ETSI TS 129 162-2004 数字蜂窝通信系统(第2+阶段).全球移动通信系统(UMTS).IM CN子系统和IP网间的互通.3GPP TS 29.162(版本6.0.0,第6次发布)
Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); Interworking between the IM CN subsystem and IP networks 3GPP TS 29.162 version 6.0.0 Release 6