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.
Asiasoft Software Technology Co.,Ltd (Asiasoft) was founded at the beginning of 2000, whose main business focuses in China. It owns multi-stock shared firms in Beijing, Shenyang and Hongkong.