ETSI TS 124 091-2017 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);呼叫转移(ECT)补充业务;第3阶段(V14.0.0;3GPP TS 24.091 版本14.0.0 发行版本14)
Digital cellular telecommunications system (Phase 2+) (GSM); Universal Mobile Telecommunications System (UMTS); Explicit Call Transfer (ECT) supplementary service; Stage 3 (V14.0.0; 3GPP TS 24.091 version 14.0.0 Release 14)