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  1. frankyu

    Does call between GSM users go through PSTN?

    it's depends, if the carrier has their own transmission system, they needn't let the call through PSTN, for a MS(mobile subscriber) to MS call, MSC/VLR first analyse the called party number(it's a SS7 process,happen in STP-signal transmit point ), if it's belong to the same network, the STP...

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