voice Features call hold; Unattended/ attended call transfer call waiting and per call-waiting blocking call forward (Always, busy, no answer, power off) voip speed dial VoIP digital map user define ring tone E.164 dial plan and customize dial rules caller number/name display voice promote configurable jitter buffer size configurable audio frame  Support Bridge and Router model Support dual sip public server  data features  Static/Dynamic WAN-IP-Addressing  PPPoE  management and provisioning  http, telnet, keypad and dedicate manage tool  adjustable user password and super password  URL based FTP,HTTP and TFTP auto provision  Configure file download and upload by  support four settings storage, switch by keypad  safe mode provide reliability  four servers store and load by keypad  80 entries each for missed calls, answered calls and dialed calls  100 entries for speed dial number  Multiply Language support  Interfaces  1 X WAN 1 X LAN data networking MAC Address TCP:Transmission Control Protocol  DHCP:Dynamic Host Configuration Protocol PPPoEPPP Protocol over Ethernet SNTP, Simple Network Time Protocol STUN - Simple Traversal of User Datagram ... TOS:Type of service DNSDomain Name Server Support Bridge and Router model.  RTP: Real-time Transport Protocol RTCP:Real-time Control Protocol Telnet:Internet's remote login protocol HTTP:Hyper Text Transfer protocol FTP:File Transfer protocol TFTP:Trivial File Transfer Protocol call control /voip Features SIP RFC3261 Tone generation and Local DTMF re-generation according with ITU-T voice algorithms G.711(A-law or u-law) G.723.1(6.3kbps,5.3 kbps) G729/iLBC AGC(Auto Gain Control) G.168/165 compliant 16ms echo cancellation AEC(Auto Echo Cancellation) VAD (Voice Activity Detection) CNG(Comfort Noise Generation)  Enviromental Electric requirements Voltage: 5V ~ 24V Power adapter: output DC 5V/1A Operating requirement Operation temperature: 0 to 40° C ( 32° to 104°F) Storage temperature: -30° to 65° C (-22° to 149°F) Humidity: 10 to 90% no dew Standard Component: Item Qty Remarks Phone 1 LCD Display, Keypad Adaptor 1  CD 1 User Manual Ethernet Port 2  Cable N/A