Detailed Product Description

X255 IP phone is a next generation IP network telephone based on industry open standard sip (session initiation protocol) and h.323. Built on innovative technology, x255 IP phone features market leading superb sound quality and rich functionalities at mass-affordable price.

Features

Support two models: Bridge and router (nat&napt)
Network protocols: Tcp/udp/IP, icmp, HTTP, dhcp client(wan interface), dhcp server(lan interface), dns client, dns relay, sntp, pppoe, ftp, tftp
VOIP protocols: Support h323 (v4)&sip (rfc3261, rfc3262, rfc3264, rfc3265) synchronously
Voice codecs: G.711(a-law/u-law), g.723.1, g.729a/b, g.726, and g.722
Redundancy sip server (or gate keeper): Can auto swap address between two servers address
Nat transversal: Support stun client, avs and citron etc. Can modify sip register port, HTTP server port, telnet server port and rtp port
Support two sip server synchronously: Can register two different sip server, and can make a call by either proxy
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
Full duplex hands-free speakerphone, redial, call log, volume control, voice record with indicator
Support standard encryption and authentication (digest using md5, md5-sess)
Support silence suppression, vad (voice activity detection), cng (comfort noise generation), line echo cancellation (g.168), and agc (automatic gain control)
Provide easy configuration thru manual operation (phone keypad, web interface and telnet) or automated centralized configuration file via tftp or HTTP.
Support firmware upgrade via tftp/ftp and HTTP
Support syslog, can send event of phone to syslog server.