Telephone features: Network protocols Http, rtp, rtcp, tftp, tcp, udp, dhcp, dns, arp, icmp, ntp, igmpv2, Snmpv2, pppoe Http(webserver): For configuration of voip device Tftp: For in-field software update Dhcp: For ip address assignment Protocols Sip(rfc-25433261) Audio standards Vocoder: Itu g.711(pcm)one low bit rate(g729a/b), g.723(option) Local loop: Dial tone, busy tone, call-waiting tone, Ring-back tone, network busy tone Supports g.165/g.168, aec, agc, lec Dtmf/tone generation and detection Vad: Voice activity detection Cng: Comfort noise generation Button&led features 12 standard dialing keys:0~9, *, # 8 feature keys: Flash, redial, hold, speaker, mute, conf. 8 speed dial keys. Adjustable speaker/ring/handset volume by button. Hearing aid compatible handset Lcd 2*16 character mode lcd display Provide features such as date/time, calling party name, calling party number, digits dialed&system information Telephony interface Hold, mute, speaker, message, and conf. Large indicator for message or voice mail Network interface 1/2 standard 10/100 base-t rj-45 ports: One for network to phone connection, and one hub port for connection from phone to pc Additional features Remote configuration&upgrade through web browser. Pppoe auto redials capability. Full function phone book operation. Case 220 x 170 x 90 mm Power External power brick,5vdc,800ma Colors: White black, metalic blue, dark blue, silver white etc. Units per carton:80 Weight:18.40kg/ctn Measurement: L53.98cm*w53.66cm*h36.51 cm Main export markets: Europe, america, asia, middle east, australia, south africa