1.         Protocol support: SIP(RFC2543, RFC3261)

2.         64 groups incoming calls memory displayed, stored

3.         64 groups outgoing calls memory reviewed, stored

4.         Phone Book with 100 groups memory

5.         Hand-free dialing function, calculate conversation charge 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

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 support

16.     Anti-parallel function

17.     Support protocol TCP/IP(ARP/RARP, IP/ICMP, UDP/TCP/IP, RTP/RTCP)

18.     Support TFTP and Console function

19.     IEEE 802.IP /802. IQ/ToS U 110 Base T / 100Base TX

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 updates/upgrades