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The SIP-T42S is a business tool for exceptional communication and extended functionality. It offers a responsive user interface than the T42G and other powerful features. It is a 12-wire IP phone and is equipped with programmable buttons for better productivity. The SIP-T42S, which supports Yealink Optima HD voice technology and broadband opus codec, provides superior audio quality and crystal clear communication. Furthermore, a Gigabit Ethernet technology has been installed for even faster handling. The phone comes with a new USB port, Bluetooth, Wi-Fi and USB recording capabilities. The new T4S series offers the same elegant appearance of the T4 line, but with improved compatibility.