Specifications: Interface: 1 port WAN: 10/100M BaseT Auto-Negotiation (RJ45) 4 port LAN: 10/100M BaseT Auto-Negotiation (RJ45) 4 port Analog Phone interface: FXO/FXS interface change through the button(RJ11) Voice Support : H.323 protocol RTP/RTCP Code G.711, G.729A/B, G.723.1, G.726 Echo Cancellation G.168 (Max 128 ms) Comfort noise generation (CNG) Voice Active Detection (VAD) MF and DTMF Detection and Generation Intercom IP Caller ID Detection and Display Busy Signal Detection Gain Control FAX Support : T.30 and T.38 with UDP Network and Management PPPOE /DHCP /Static IP Support NAT SNMPV2 and Private Protocol SNMP Upgrade Remote and Maintenance Remote Setup Easy Sofeware Support RJ 45 Console port We have other type gateway which have 2 ports,4 ports,8 ports,16ports,32ports