Ideal for the knowledge worker who relies on telephone communications, the IP 230 delivers a wealth of features including three line appearances, eight function keys, four soft keys, and a headset jack.Highlights 3 Lines Integrated 10/100 Ethernet switch Full duplex SpeakerphoneFeaturesFeature KeysTransferConferenceHoldIntercomRedial (History)VoicemailOptionsDirectoryDisplay24 character x 5 line display120 x 35 pixelsSpeakerphoneFull duplexAudio ControlsVolume (independent control)Mute (LED indicator)Speakerphone (LED indicator)Headset (LED indicator)SpecificationsMGCP protocolVLAN, DiffServ/ToS, 5004/UDP QoS,G.722, BV-32, BV-16, G.711, G.729a codecsBuilt-in 10/100 Ethernet switch802.3af PoE (standard), or local power (optional)Class 2 PoE (2.9 W idle / 3.6 W active / 4.4 W max)EnvironmentalHumidity : 5-90% relative humidity (non-condensing)Operating temperature : 0-50° C