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.
Assalam O Aliekum I have some routes for Mobile Voip. If someone wants to start business with me then feel free to contact with me.
Skype ID : aamirjatialy
Email ID : aamirjatialy@yahoo.com