ETSI PRETS 300 356-14-1994 综合业务数字网(ISDN).CCITT 7号信令系统.用于国际接口的ISDN用户部分(ISUP)(版本2).第14部分:显式呼叫转移(ECT)补充业务
Integrated Services Digital Network (ISDN); CCITT Signalling System No. 7 ISDN User Part (ISUP) Version 2 for the International Interface Part 14: Explicit Call Transfer (ECT) Supplementary Service