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Recent content by frankyu

  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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