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.
Cloud based Sip provider, Giving acces to voice in the cloud. Cutomer based sip hosting or dedicated hosted sip. Creating backup sip pbx for omnipcx Enterprise 40X8EE sets.