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.
Speedflow is a provider of high-quality VoIP (A-Z Wholesale, CLI routes, CC routes) and SMS services. The company offers VoIP software solutions (MediaCore SBC, AccuCore ERP) and custom software development services.