Integrated Services Digital Network (ISDN); Signalling System No.7; ISDN User Part (ISUP) version 2 for the international interface; Part 14: Explicit Call Transfer (ECT) supplementary service
综合业务数字网(ISDN);七号信令系统;国际接口的ISDN用户部分(ISUP)第2版;第14部分:显式呼叫转移(ECT)补充业务