Polycom SoundStation IP 4000(Requires Polycom PoE Interface Module or IP 4000 Power Supply)VoIP Protocols:SIPVoice Codecs: G.729a, G.729ab, G.711aCaller ID: YesDisplay: LCD display -monochromeDisplay Features:BacklitNetworkPorts Qty:1 x Ethernet10/100Base-TXProductivity Suite is compatible with limited features:Corporate Directory AccessPart Number:2200-06640-001SoundStation IP 4000With improved audio quality over the original Polycom SoundStation IP 3000 conference phone, theSoundStation IP 4000SIP voice conferencing unit is the answer for organizations that are ready for the benefits and versatility of a SIP enabled business. Designed for offices or small to medium sized conference rooms, the SoundStationIP 4000 SIPprovides remarkable room coverage. You can speak naturally from up to 10-feet away from amicrophoneand still be heard clearly on the far end of the call. Need coverage for a larger room? The optional extension microphones offer an increased pickup for larger rooms. Plus, with gated microphone technology, echo and background noise is almost entirely eliminatedFor your next conference call, enjoy great voice quality and the convenience of connecting directly into your SIP-based call management system* with the Polycom SoundStationIP 4000 SIP. And, coupled with Polycom's desktop SoundPoint IP SIP telephones, theSoundStation IP 4000 SIPis the natural addition to your IP conference room and office.