多项选择题
A.SGSN B.iGGSN C.DNS D.FW
A.DNS/DHCP B.SGSN C.IGGSN D.HLR
A.Cisco router B.SGSN C.FW D.IGGSN
A.M-CDR B.S-CDR C.S-SMT-CDR D.G-CDR
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