An all-round SIP phone for clear communication. The SIP-T43U is a feature-rich business tool for first-class communication and advanced functionality. This is a 12-line IP phone with a 3.7-inch black and white display and EXP43- Support. With United Yealink Optima HD Voice technology and Opus wideband codec, the T43U provides you with excellent audio quality and crystal clear voice communication. Executing call functions feels more responsive and faster. In addition, the T43U has two USB ports, that allow Bluetooth, Wi-Fi, USB headsets and USB recording, and you can use any two of them according to your needs. The new T4U series from Yealink has the same elegant design of the T4 line - but with improvements for even better Interoperability and collaboration.