Voip SIP Phone(Support Headset)

Key Features and compatibility.

1.    Support two models: Bridge and Router(NAT&NAPT)

2.    Network Protocols: TCP/UDP/IPICMPHTTPDHCP ClientWAN InterfaceDHCP ServerLAN InterfaceDNS ClientDNS RelaySNTPPPPoEFTPTFTP

3.    Sip protocols

4.    Voice Codecs: G.711A-law/U-lawG.723.1G.729A/BG.726,and G.722

5.    Redundancy SIP server (or Gate Keeper): Can auto swap address between two servers address

6.    NAT transversal: Support STUN client, AVS  and Citron etc . Can modify SIP register portHTTP server portTelnet server port and RTP port

7.    Support two SIP server synchronouslyCan register two different SIP server, and can make a call by either proxy

8.    Support Headset

9.    Support standard voice features such as numeric Caller ID Display, Call Waiting, Hold, Transfer, Do-Not-disturb, Forward, in-band and out-of-band DTMF, Hotline (off hook autodial), auto answer,ban outgoing

10.Full duplex hands-free speakerphone, redial, call log, volume control, voice record with indicator

11.Support standard encryption and authentication (DIGEST using MD5, MD5-sess)

12.Support Silence Suppression, VAD (Voice Activity Detection), CNG (Comfort Noise Generation), Line Echo Cancellation (G.168), and AGC (Automatic Gain Control)

13.Provide easy configuration thru manual operation (phone keypadWeb interface and Telenet) or automated centralized configuration file via TFTP or HTTP.

14.Support firmware upgrade via TFTP/FTP and HTTP

15.Support syslog, can send event of phone to syslog server.
16.Support POE (Power Over Ethernet)