A.由拜訪省SGSN經(jīng)拜訪省GGSN送至外部數(shù)據(jù)網(wǎng)
B.由拜訪省SGSN經(jīng)歸屬GGSN送至外部數(shù)據(jù)網(wǎng)
C.由歸屬省SGSN經(jīng)拜訪省GGSN送至外部數(shù)據(jù)網(wǎng)
D.由歸屬省SGSN經(jīng)歸屬省GGSN送至外部數(shù)據(jù)網(wǎng)
A.CSCF
B.BGCF
C.MGCF
D.HSS
A.UTRAN
B.RNC
C.UE
D.NODE B