Features 1. Protocol support: SIP (RFC2543, ARFC3261) 2.64 groups incoming c alls memory displayed stored 3.64 groups outgoing calls memory reviewed stored 4. Phone Book with 100 groups memory 5. Hand-free dialing funtion, calculate conversation time automatically 6. Outgoing calls memory reviewed deleted redialed 7. Refused to answer call function 8. Roaming function 9. Local number check 10. Pre-dial function 11. Date and time display 12. Music hold function 13. PPPOE port: Point t o Point of ethemet 14. IP address dynamic and static dual system compatible 15. Support voice code format G.711A/U G.723.1 .729A/B auto selection, VAD/CNG save band-width 16. Anti-parallel function 17. Support protocol TCP/IP (ARP/RARP BIP/ICMP UDP/TCP/IP BRTP/RTCP) 18. Support TFTP and Console function 19. IEEE 802.IP /802. IQ/ToS U 110 Base T / 100Ba X 20. Support Domain Name (DNS) 21. Transfer calls function 22. Three -way conversation 23. Call waiting function 24. Call transferring function 25. DDNS function 26. Remote software s/upgrades