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The SIP-T48S is a dynamic communication solution for busy executives. This phone features a large touchscreen display that lets you switch between different pages and applications. The SIP-T48S, which supports Yealink Optima HD voice technology and broadband opus codec, provides superb audio quality and crystal clear communication. The phone comes with Gigabit Ethernet technology for even faster handling and the use of accessories such Bluetooth and WiFi USB dongle. The new T4S series offers the same elegant appearance of the T4 line, but with improved compatibility.