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3G call Flow
MOC – Mobile Originated Call (1/3)
MOC – Mobile Originated Call (2/3)
MOC – Mobile Originated Call (3/3)
NRT – GTP Tunnel Setup
MTC – Mobile Terminated Call (1/3)
MTC – Mobile Terminated Call (2/3)
MTC – Mobile Terminated Call (3/3)

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3 g call flow