A语音业务:BTS-GEIUB-GTNU-GEIUT-GEIUT-GTNU-GDPUC=GTNU-GEIUA-MSC
B接口7号信令:MSC-GEIUA-GSCU-GEIUT-GEIUT-GSCU-GXPUM
C分组业务:BTS-GEIUB-GTNU-GEIUP-PCU
DAbis接口信令:BTS-GEIUB-GSCU-GXPUM
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