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    ● GSM VOIP gateway
    Product Name:  GOIP-4i GOIP GSM gateway
    Model No:  GOIP-4i
    Commodity Numbers:  10000
    Browse Times:  2012/7/15 3:40:12
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    Product name: Voip GSM gateway
    Model: GOIP-4i
    SIM channels: 4 ports
    Work frequency:850/900/1800/1900mhz
    Support ITU H.323 V4 and IETF SIP V2
    Built-in antenna 
    Support IMEI change
    Support Sim Bank
    support multi-device group
    Warranty: one year 

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