Revolutionarily new design As Yealink ‘s SIP Phones continue to evolve, the SIP-T48S has been designed by pursuing ease of use with a scratch-resistant 7 inch touch screen, the T4 Series’ signature metallic texture, non-slip rubber feet, and ergonomic recessed buttons. HD Audio Yealink Optima HD Voice refers to the combination of software and hardware design as well as the implementation of wideband technology to maximize acoustic performance. Coupled with advanced acoustic clarity technology such as full duplex, echo cancellation, and an adaptive jitter buffer, the SIP-T48S creates an amazing face-to-face experience. A rich visual experience for applications The SIP-T48S supports vast productivity-enhancing features such as a XML Browser, call forwarding, call transfer, 3-way conferencing, and support for a vast number of UC platforms for a superior UC experience. The 7″ 800 x 480-pixel color touch screen with backlight enables rich visual presentation and easier menu navigation. Advanced connectivity For network connectivity, the SIP-T48S comes with two Gigabit Ethernet ports, one of them suitable for Power over Ethernet. The SIPT48S also includes a built-in USB port, which supports Bluetooth headsets with the Yealink BT40. Highly secure transport and interoperability The SIP-T48S uses SIP over Transport Layer Security (TLS/SSL) to provide service providers with the latest technology for enhanced network security. The range is certified compatible with 3CX, Asterisk, and BroadSoft.

Audio Features
• HD voice: HD handset, HD speaker
• Codecs: Opus, G.722, G.711(A/µ), G.723.1, G.729AB, G.726, iLBC
• DTMF: In-band, Out-of-band(RFC 2833) and SIP INFO
• Full-duplex hands-free speakerphone with AEC
• VAD, CNG, AEC, PLC, AJB, AGC
Display and Indicator
• 7″ 800 x 480-pixel color touch screen with backlight
• 24 bit depth color
• LED for call and message waiting indication
• Wallpaper
• Intuitive user interface with icons and soft keys
• National language selection
• Caller ID with name, number and photo
Interface
• Dual-port Gigabit Ethernet
• Power over Ethernet (IEEE 802.3af), class 3
• Built-in a USB port, support Bluetooth headset (Through USB Dongle)
• 1xRJ9 (4P4C) handset port
• 1xRJ9 (4P4C) headset port
• 1XRJ12 (6P6C) EXT port: Supports up to 6 Expansion Modules for an attendant console application
Other Physical Features
• Wall mountable (optional)
• External universal AC adapter (optional): AC 100~240V input and DC 5V/2A output
• Power consumption (PSU): 2.0-6.4W
• Power consumption (PoE):2.4-10.5W
• Dimension(W*D*H*T): 266mm*226mm*185mm*54mm
• Operating humidity: 10~95%
• Operating temperature: -10~50°C