The SoundStation IP 6000 is a SIP conference phone that delivers legendary audio performance for small to midsize conference rooms. The SoundStation IP 6000 features Polycom HD Voice technology, boosting productivity and reducing listener fatigue by turning ordinary conference calls into crystal-clear interactive conversations. It delivers high-fidelity audio from 220 Hz to14 kHz, capturing both the deeper lows and higher frequencies of the human voice for conference calls that sound as natural as being there. Optional expansion microphones (sold separately) POE 802.3af (Power over Ethernet) Power Supply not included.