Performance and features
    Support SIP,IAX2,H323 protocol
    NAT, Firewall.
    It can register two SIP account and one IAX2 account in the same time.
    All there 3 account can be used as  called anytime,and for the caller,it can be slelected by setting different dial prefix.
    DHCP client and server.
    Support PPPoE, (used for ADSL, cable modem connecting).
    Support major G7.xxx CODEC. VAD,CNG.
    G.711 u/a; G729, G7231 5.3/6.3 audio Codec
    G.168 compliant 32ms echo cancellation
    Tone generation and Local DTMF re-generation according with ITU-T
    E.164 dial plan and customi ed dial rules
    Hotline.
    Speed Dial
    Call Forward, Call Transfer, 3-way conference calls
    Record
    Support POE [optional]
    Caller ID display
    DND(Do Not Disturb),Black List,Limit List
    Upgrade firmware through FTP, TFTP or HTTP,.
    Web management.
    Telnet remote management.
    adjustable user password and super password
    IEEE 802.3 /802.3 u 10 Base T / 100Base TX