By using Portech SBK-32 expander for 32 SIM-cards, you can increase the number of channels in the Portech MV-37X GSM VoIP gateway series using the Internet.
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Minute Exchange has been serving the Telecommunications community since 2003. We specialize in Wholesale Minutes, VoIP Interconnection, Inbound Services and Switch Partitions as well as many other telecommunications services.
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