Gsm Gateway Provider makes it possible to make external calls over the GSM network. It allows direct routing between IP and GSM Networks.
The PRI card is used to connect PRI lines to IP PBX / IP telephony servers so that all IP phones /analog phones (Extensions) can make outgoing calls or receive incoming calls using it.
IP Phones change the communications experience, adding new collaboration modes to VoIP, such as HD voice, video, conferencing, and wireless.
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Synway 32 Port GSM VoIP Gateways with SMS API