Specifications: Overview It is a well tested multi-protocol IP phone. This desktop IP handset supports the h323, mgcp, and sip protocol and can be used with many VOIP service providers around the world. It is a plug and plays unit that supporting static IP, nat, dhcp and pppoe ADSL dialup. Just simple plugging it into the ethernet port of your ADSL/cable router, you can make/answer both internet calls. It supports several voice codec and its excellent sound quality and smart style have made it a perfect VOIP device for both office and home use. Perform free VOIP calls - just install one phone set for your home location and install one set at far site. Connect it to the internet and you can enjoy unlimited air time between sites. It\'\'s proven that compatible most of the well known branded VOIP device such as cisco gatekeeper and gateway. A dedicated 8-digits virtual telephone number will be bundle to each phone set to allow you to make and receive call within our VOIP network. You can also apply our off-net call service and purchase idd value to perform international long distance call@extremely low and flat rate. Functions and features - static IP, nat and dhcp support for LAN or cable modem - pppoe support for ADSL or cable modem - set phone by HTTP web browser(ie60) or telnet - upgrade by ftp - support major g.711, g.729, g7231 and gsm610 audio codec - dynamic voice test - cng(comfortnoise generation) - dynamic voice jitter buffer - vad(voiceactivation detection) - g.168/165 compliant 16ms echo cancellation - tone generation and local dtmf re-generation according with itu-t - e.164 dial plan and customized dial rules - 100 entries for speed dialing - 80 entries each for missed calls, answered calls and dialed calls - adjustable volume for both handset and speaker - voice prompt - support call forward and holding Specification Lan 1(rj-4510/100 base-t interface) Protocol h.323 v2/v3/v4, h.235 security, h.450(callforward/call transfer/call on hold), HTTP, tcp/IP Voice codec g.711 PCM 64kbps(a-lawand u-law), g.723.1a acelp/m-mlq(53,6.3kbps), g.729ab(cs-acelp8kbps) Echo cancellation g.168/g.165 compliant echo cancellation Voice processing voice activity detection(vad)in-band and h.245 out of band dtmf generation/detection Echo cancellation(ecn)comfort noise generation(cng)bad frame interpolation Call control h.323/sip/mgcp Management keypad management Built-in HTTP server allowing management from web browser Command line interface allowing management from telnet Voltage dc 12v-24v Power adaptor dc 12v/450ma Environmental operating temperature:0 to 50 degree c Storage temperature: -30 to 65 degree c Humidity:10 to 90%(non-condensing)speaker phone equipped Speed dial 100 preset speed dial number Goods dimension (200 x 195 x 87)mm