ETSI TS 124 294-2017 数字蜂窝通信系统(第2+阶段)(GSM全球移动通信系统);通用移动通信系统(UMTS);长期演进技术(LTE);经由I1接口的IP多媒体子系统(IMS)集中业务(ICS)协议(V14.0.0;3GPP TS 24.294,版本14.0.0 发行版本14)
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; IP Multimedia Subsystem (IMS) Centralized Services (ICS) protocol via I1 interface (V14.0.0; 3GPP TS 24.294 version 14.0.0 Release 14)