单项选择题
A.DPC=own，user=SCCP，routingindicator=0. B.DPC=foreign，user=SCCP，routingindicator=0. C.DPC=own，user=ISUP，messagetype=0. D.DPC=own，user=SCCP，routingindicator=1.
A.TCP B.ISUP C.INAP D.CAP
A.MOC B.MTC C.MSC间切换 D.MSC内切换