Check the listing for details. Cisco 8831 Unified IP Conference Phone. Condition: Open box. Listed at 69.99 USD. Get audio communications support for executive offices and small-to-large conference rooms up to 1140 square feet (106 square meters)* with the Cisco Unified IP Conference Phone 8831. The 8831 supports Cisco on-premises, hosted, and pre-approved third-party Unified Communications as a Service (UCaaS) platforms. The phone comes standard with a wired control panel and dial pad that extends from the base station. This adds convenience and flexibility for multi-chairperson meetings. The 8831 delivers full-duplex, two-way wideband (G.722) acoustic audio for superior audio performance. With the 8831, you have a choice of accessories, with both wired and Digital Equipment Cordless Telephony (DECT) wireless extension microphones and charging stations.