Features: 1. Support SIP / H.323 2. One 10/100 BASE-T WAN port. One 10/100 BASE-T LAN port. 3. 4 FXS interface (RJ-11), used to connect 4 telephones 4. Support CODEC: G.711A/U,G.723.1(5.3K/6.3K), G.729A(8K), G.726(16K,24K,32K,40K) CNG(Comfort Noise Generation), G.168 (Echo Cancellation) VAD(Voice Activity Detection) 5. Supporting DHCP Client/static IP address allocation plan 6. Self-adaptive jitter cache ensures smooth voice function Lost-packet compensation guarantee mechanism provides a better voice quality. 7. Built-in Internet gateway function 8. Supporting NAT (Network Address Translation) and NAPT 9. Supporting DHCP Server, used for the dynamic address allocation plan of LAN devices 10. Built-in PPPoE client, used for broadband access user authentication Easily-configured Console port 11. Supporting remote configuration of Web mode and remote software downloading/upgrading 12. No need to add dialing "#" after the target no.