The T42U IP phone is a feature-rich business tool for excellent communications and extended functionality. Coming with plentiful built-in programmable keys, this six-line IP phone guarantees enhanced productivity. United Yealink Optima HD Voice technology and wideband codec, the T42U awards you superb audio quality and crystal-clear voice communications. The phone feels quicker and more responsive when performing call features. Moreover, the T42U puts dual USB ports in a phone that makes Bluetooth, Wi-Fi, USB headset and USB recording come true, and you can use any two of them freely according to your needs.