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.
Shetab phone-to-phone service has been stabilished in 1380 (2001), presenting a pleasant quality in international calls, using VoIP technology via E1 digital lines.Shetab provides various facilities for customers comfort and hospitality, w