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.
ATEX is a member fo the EUTEX-Group. Today EUTEX-Group is a leading, neutral and independent market place for international telephone traffic. With access points in Frankfurt, London and Hong Kong we are globally present.