The Avaya B189 IP Conference Phone With a sleek, modern design, the B189 IP Conference Phone looks great  in any executive boardroom or large conference room (even auditoriums). The B189 conference phone has full duplex communications that prevents audio clipping, enabling 360-degree surround sound pick-up via its two powerful speakers and four built-in microphones.  The B189 conference phone can pick up individual voices within a wide 20-foot radius.