4-FXO Port Gateway .
Support dual protocols: ITU-H.323 V4 and IETF SIP V2
Provide 4 RJ-11 ports for PSTN lines or PBX's extensions
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