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.
VoIPex is a next generation integrated telecommunications service provider. We provide for both H323 and SIP. Channel Partner and reseller programs are avialble with more information location at www.voipex.com.au