[单项选择题] SGSN gets GGSN’s IP address by communicating to () when a MS makes PDP context activation.
A.PAPU
B.HLR
C.MS
D.DNS
正确答案:D

[单项选择题] SGSN gets GGSN’s IP address by communicating to () when a MS makes PDP context activation.
A.PAPU
B.HLR
C.MS
D.DNS
正确答案:D