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.
VoipRent is a Brussels-based company providing rental solutions to VoIP Service Providers. It was founded in November 2002 as an evolution from Mobile Services, a company that was specialized in VoIP consulting.