wireless voip gateway 1,gsm voip gateway for call termination 2,support imei change 3,support sending SMS & USSD 1/4/8/16 ports gsm voip gateway,wireless voip gateway VoIP GSM Gateway GoIP bridges the GSM and the IP networks by enabling voice communications. It is installed on the Mobile SIM Card, you can register the GSM telephone on the VoIP Softswitch.it can be easily combined into arbitrary ...