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.
Rendez Limited
Rendez Ltd delivers and supports IP based phone systems exclusively to business customers. We provide SIP Trunks as well as traditional PSTN call traffic and are able to offer these services nationwide.
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