>Goodcom ATA2000 is a next generation IP network facility based on industry standard SIP ( Session Initiation Protocol). Built on innovative technology ,ATA 2000 features market leading superb sound quality and rich functionalities .They are fully compatible with SIP industry standard and can interoperate with many other SIP device. >With Built-in Router ,Infineon Chip ,support SIP 2.0, 2 RJ25 Ports , >2RJ11 Ports ,Least Cost Router and Bridge mode >Support two models : Bridge and Route ( NAT & NAPT ); >Network Protocols: TCP/UDP/IP,ICMP,HIIP,DHCP client ( WAN Interface ),DNS clients , DNS relay,SNTP ,PPPoE ,FTP,TFTP .