GoIP GSM Gateway 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 number of channels of Large Gateway Group. Low price, perfect sound quality and powerful function make GoIP GSM inevitable choice of system Integrators, traffic Business and soft switch Manufacturers.
Basic Function ：
Support dual protocols: ITU-H.323 V4 and IETF SIP V2
GSM module for making GSM calls
Provide 32/16/8/4/1 SIM Card ports for GSM extensions
Support G.711 A/μ law, G.729A/B, G.723.1 Codecs
Support Multiple dial plans and line hunt
Support QoS, NAT transversal and router function
Support VAD, CNG, EC