SIP and USB conference speakerphone, bridges IP and USB phone calls, tweeter and mid-woofer elements, 160 - 20,000 Hz frequency response. Four microphones for 360? coverage, echo cancellation, full duplex operation. The FLX UC 1000 from revolabs is an IP and USB speakerphone that is designed to accommodate a wide variety of conferencing applications for business. Doubling as a high-performance IP conference phone and a USB audio device the FLX UC 1000's design enables unified communications by supporting both USB audio for PC communication tools and SIP telephony for IP PBXs. It provides the ability to bridge IP and USB phone calls allowing parties to communicate even when using different mediums.