Yealink CP860 VoIP Conference Phone with 2 Mics (CPE80) The Yealink CP860 IP conference phone is a perfect choice for small and medium-sized conference room and can meet the demands of up to 16 people with optional expansion microphones. The CP860 provides many important audio features including optima HD technology, a build-in 3 microphone array, full-duplex technology and acoustic echo cancelling. This means that all users can enjoy rich, clear and life-like conference calls. The Yealink CP860 also supports call recording, plus linkages to mobile phones or PCs for a more convenient conference call experience. With the additional expansion microphones, the CP860 is the ideal conference phone for medium to large size conference room that need extended coverage at the far ends of a conference table. The expansion microphones extend the range of the CP860 by an additional 10 feet respectively.