IAD4000S 4 ports voip gateway IAD4000S voice gateway is a kind of multi-function voice/fax/multimedia terminal. It support standard SIP、PPPoE、DHCP、SNMP、RTP、RTCP protocols and support multiple network access means(ADSL、Cable Modem、etc). It is able to provide operators and virtual operators with highly cost-effective VOIP solutions such as IP telephone super markets and enterprise branches. Key Feature and Benefits: Voice Feature: Codec：G.711A/u,G.7231 high/low, G.729 G.168 echo cancel VAD RFC2833 DTMF Relay SIP Features: Standard SIP protocol NAT , STUN Free peer to peer SIP call Networks Features： Basic NAT and NAPT PPPoE for ADSL SNTP Static WAN IP and DHCP Maintenance and Management： HTTP WEB manager HTTP/TFTP upgrade firmware Adjustable user password and super password IVR for network setting by handset SNMP Call Control Features： Flexible Dial Map End with # Dial Map Table Dial with time out Interfaces： One 10/100 Base T RJ-45 for WAN Four RJ-11 interfaces for telephone TYPE IAD4000DS Environment Avoid rain, dust, direct sun shine Size 150mm?10mm?0mm Voltage IN：100~240V、50/60Hz、0.3A OUT：+12V~0.8A Input <3W Temperature -20℃～50℃ Relative Humidity 5%～95%