Rarely used.  The Polycom SoundStation IP 6000 2200-15600-001 SIP Conference Phone is a high-quality audio conferencing device designed for business meetings and collaborations. With its HD voice capabilities, this conference phone ensures clear and crisp communication for all participants. The Polycom brand is known for its reliable and cutting-edge telecommunications equipment, making this product a top choice for companies seeking superior audio quality in their conference calls.