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.
MEGALINE is a carrier-grade VoIP service provider specializing in three areas: Business-Class VoIP, Residential VoIP and Call Shop Turnkey Solutions. With our unique "Multi-Carrier"TM