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.
Go2Call
Go2Call delivers a complete suite of hosted international VoIP solutions to providers worldwide. Go2Call`s back-office solutions enable carriers and resellers, broadband service providers, ISPs, new VoIP license holders, call shops and other distributors
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