A revolutionary SIP phone with a 7-inch touchscreen With the new SIP-T48U, Yealink presents a dynamic business communication solution for executives and professionals. IP phone. The phone has an attractive large touchscreen that makes switching between pages and applications fast, easy and convenient. With Yealink Optima HD Voice technology and Opus wideband codec, the T48U offers excellent audio quality and crystal clear voice communication. In addition, the T48U offers two USB ports in one phone that supports Bluetooth, Wi-Fi , USB headset and USB recording, and you can use any two of them freely according to your needs. Yealink's new T4U series offers the same elegant look as the T4 series, but with improvements for greater interoperability and better collaboration.