1. Protocol support: SIP
2.10 groups incoming calls memory displayed stored
3.10 groups outgoing calls memory reviewed stored
4. Phone Book with 10 groups memory
5. Hand-free dialing function, calculate conversation time automatically
6. Outgoing calls memory reviewed deleted redialed
7. Remote software updates/upgrades
8. Roaming function
9. Local number check
10. Pre-dial function
11. Date and time display
12. Music hold function
13. DDNS function
14. IP address dynamic and static dual system compatible
15. Support voice code format G.711A/U(64K Mu-law for US and A-law for Europe) (5.3K and 6.3K) G.726 (16K, 24K, 32K, 40K) G729AB (8K) ,168-2000 echo cancellation, 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 / 100BaseTX
20. Support Domain Name (DNS)
21. Transfer calls function
22. Three-way conversation
23. Call waiting function
24. Call transferring function
25. Main Chipset DSP 622/621  
     Flash 16Mbits
     LCD Size: 65*24mm
     Weight: 0.75kg
     Unit Outer Size: 20*17*75cm
26.Operation Temperature 0～40℃
     Relative Humidity 10～65%
     Adapter (Input/Output) Input: 100-240V Output: 5V/0.5A
     1 Port WAN 10/100Base