Home Page Company Products Agents Downloads Feedback Contact Us Company Introduction Mission Legal Statement Products Telephone Terminal Broadband Gateway FXS Gateways FXS PSTN By Pass FXO Gateways FXS + FXO Gateways GSM Gateways Relay Proxy Relay Router Remote Control Server Auto Provision Server Customizes Download Document Software Download F A Q Contact Us TEL: +86(755)8829-0301 FAX: +86(755)8829-0302 You Now Position：Home Page | Products | Broadban Gateway | GSM Gateway GoIP       One Channel GSM VoIP Gateway Support dual protocols: ITU-H.323 V4 and IETF SIP V2 GSM module for making GSM calls Provide 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 hun Support QoS, NAT transversal and router function Support VAD, CNG, EC 　 [ GoIP User Manual ] GoIP_4     Four Channels GSM VoIP Gateway Support dual protocols: ITU-H.323 V4 and IETF SIP V2 GSM module for making GSM calls Support single or multiple servers registrations 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 　 [ GoIP_4 User Manual ]