A.緊急呼叫 B.無條件呼叫轉移 C.數(shù)據(jù)業(yè)務 D.短信業(yè)務
A.MAP,BSSAP,TUP B.MAP,BSSAP,ISUP,SCCP C.MAP,BSSAP,TCAP,SCCP,MTP D.MAP,SCCP,BSSAP,INAP