ETSI TS 122 004-2017 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);补充业务常规(V14.0.0;3GPP TS 22.004 版本14.0.0 发行版本14)
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); LTE; General on supplementary services (V14.0.0; 3GPP TS 22.004 version 14.0.0 Release 14)