A Revolutionary SIP Phone with a 7-inch Touch Screen
The SIP-T48S IP Phone is a dynamic business communications solution for executives and professionals. This phone
offers a large touch screen that makes switching between pages and applications swift, easy and convenient. The
SIP-T48S is also with Yealink’s Optima HD Voice technology and wideband codec of Opus for unparalleled audio
clarity. Phone users will think they are sitting in the same room with one another. The phone uses Gigabit Ethernet
technology for rapid call handling. Plus, it works in conjunction with Bluetooth USB Dongle and Wi-Fi USB Dongle.
The new T4S series offers the same elegant appearance of the T4 line, but with improvements for greater
interoperability and collaboration.
Touch Screen
HD Voice
Opus Codec
USB 2.0
Key Features and Benefits
HD Audio
Yealink Optima HD Voice technology combines cutting-edge hardware and software
with wideband technology for maximum acoustic performance. Being a totally open,
highly versatile audio codec, Opus, is designed to perform a higher HD audio quality
than other wideband codecs in a high network bandwidth; However, if your current
network quality is poor, Opus can provide you with a better audio quality than other
narrowband codecs. And its hearing aid compatible (HAC) handset helps the person
who is with hearing loss to hear the voice more clearly.
• 7" 800 x 480-pixel color touch
screen with backlight
• Opus* codec support
• USB 2.0
Easy Customization and High Expandability
The SIP-T48S has a seven-inch, 800 x 480-pixel, backlit- color touch screen, which
enables a rich visual presentation and easy easy navigation. A built-in USB 2.0 port can
also be used for Bluetooth, Wi-Fi and USB call recording. The phone supports up to six
expansion modules, for up to 240 additional buttons with a screen-based LCD display
and LED system. Plus, it has 29 one-touch DSS keys which can be programmed to
various features.
• T4S Auto-P template unified
• T4S firmware unified
• Up to 16 SIP accounts
• Dual-port Gigabit Ethernet
• PoE support
Efficient Installation and Provisioning
• Paperless label design
The Yealink T4S series supports efficient provisioning and effortless mass deployment
with Yealink’s Redirection and Provisioning Service (RPS) and Boot mechanism to help
you realize the Zero Touch Provisioning without any complex manual settings, which
makes the T4S series simple to deploy, easy to maintain and upgrade. Furthermore, a
unified firmware and auto-p template that applies to all T4S phone models (T41S, T42S,
T46S and T48S), saves even more time and costs for businesses, as well as simplifies the
management and maintenance.
• Headset, EHS support
Secure Transport and Interoperability
• Stand with two adjustable angles
The SIP-T48S uses SIP over Transport Layer Security (TLS/SSL), which is the latest
network security technology. It’s also compatible with leading soft switch suppliers 3CX
and Broadsoft Broadworks.
• Wall mountable
• Wi-Fi via WF40
• Bluetooth via BT40
• USB recording
• Supports expansion modules
SIP-T48S Specifications
Audio Features
Display and Indicator
> Zero-sp-touch, TR-069
> HD voice: HD handset, HD speaker
> 7" 800 x 480-pixel color touch screen with backlight
> Phone lock for personal privacy protection
> Hearing aid compatible (HAC) handset
> 24 bit depth color
> Reset to factory, reboot
> Codecs: Opus*, G.722, G.711(A/µ), G.723.1, G.729AB,
> LED for call and message waiting indication
> Package tracing export, system log
> Wallpaper
G.726, iLBC
> DTMF: In-band, Out-of-band (RFC 2833) and SIP INFO
> Intuitive user interface with icons and soft keys
> Full-duplex hands-free speakerphone with AEC
> Multilingual user interface
> Caller ID with name, number and photo
> Screensaver
Network and Security
> SIP v1 (RFC2543), v2 (RFC3261)
> Call server redundancy supported
> NAT traversal: STUN mode
> Power saving
> Proxy mode and peer-to-peer SIP link mode
> Call hold, mute, DND
Feature keys
> HTTP/HTTPS web server
> One-touch speed dial, hotline
> 29 one-touch DSS keys
> Time and date synchronization using SNTP
> Call forward, call waiting, call transfer
> 7 features keys: message, headset, hold, mute,
Phone Features
> 16 VoIP accounts
> IP assignment: static/DHCP/PPPoE
transfer, redial, hands-free speakerphone
> Group listening, emergency call
> QoS: 802.1p/Q tagging (VLAN), Layer 3 ToS
> Redial, call return, auto answer
> 6 navigation keys
> 3-way conferencing
> Volume control keys
> SRTP for voice
> Direct IP call without SIP proxy
> Illuminated mute key
> Transport Layer Security (TLS)
> Ring tone selection/import/delete
> Illuminated headset key
> HTTPS certificate manager
> Set date time manually or automatically
> Illuminated hands-free speakerphone key
> AES encryption for configuration file
> Dial plan, XML Browser, action URL/URI
> Digest authentication using MD5/MD5-sess
> RTCP-XR (RFC3611), VQ-RTCPXR (RFC6035)
> OpenVPN, IEEE802.1X
> Dual-port Gigabit Ethernet
> USB port (2.0 compliant) for:
> Power over Ethernet (IEEE 802.3af), class 3
Bluetooth earphone through BT40,
> 1 x USB port (2.0 compliant)
Contact synchronization through BT40,
> 1 x RJ9 (4P4C) handset port
Wi-Fi through WF40,
USB call recording through USB flash drive
> Enhanced DSS key
> Loal phonebook up to 1000 entries
Package Features
> Package content:
Supports up to 6 Expansion Modules for an attendant
- Yealink SIP-T48S IP phone
console application
- Handset with handset cord
- Ethernet Cable (2m CAT5E FTP Cable)
- Stand
> External Yealink AC adapter (optional):
> Smart dialing
AC 100~240V input and DC 5V/2A output
> Phonebook search/import/export
> Call history: dialed/received/missed/forwarded
> Power consumption (PSU): 2.2-4.9W
IP-PBX Features
> Dimension (W*D*H*T):
> Power consumption (PoE): 3.2-7.5W
> Busy Lamp Field (BLF)
> Bridged Line Apperance (BLA)
> Operating humidity: 10~95%
> Anonymous call, anonymous call rejection
> Operating temperature: -10~50°C (+14~122°F)
> Hot-desking, voice mail
> 1 x RJ12 (6P6C) EXT port:
> Wall mountable (optional)
> XML/LDAP remote phonebook
> 1 x RJ9 (4P4C) headset port
Other Physical Features
> Black list
> IPv6
- Quick Start Guide
- Power Adapter (Optional)
- Wall Mount Bracket (Optional)
> Qty/CTN: 5 PCS
> N.W/CTN: 8.2 kg
> G.W/CTN: 9.0 kg
> Giftbox size: 324mm*263mm*128mm
> Carton Meas: 660mm*338mm*273mm
> Flexible seating
> Configuration: browser/phone/auto-provision
> Call park, call pickup
> Auto provision via FTP/TFTP/HTTP/HTTPS
> Executive and Assistant
for mass deploy
> Centralized call recording
> Auto-provision with PnP
> Visual voice mail
> Call recording
* Opus: Support 8 kHz (narrowband) and 16 kHz (wideband) sampling rate
USB 2.0
USB Dongle
Learn More
To find out how Yealink solutions can help your organization, visit us at or mail to
About Yealink
Yealink (Stock Code: 300628) is a global leading unified communication (UC) terminal solution provider that primarily offers video
conferencing systems and voice communication solutions. Founded in 2001, Yealink leverages its independent research and
development and innovation to pursue its core mission: “Easy collaboration, high productivity.” The company’s high-quality UC
terminal solutions enhance the work efficiency and competitive advantages of its customers in over 100 countries. Yealink is the
world’s second-largest SIP phone provider and is number one in the China market.
Copyright © 2017 Yealink(Xiamen) Network Technology CO., LTD. All rights reserved. No parts of this publication may be reproduced
or transmitted in any form or by any means, electronic or mechanical, photocopying, recording, or otherwise, for any purpose, without
the express written permission of Yealink(Xiamen) Network Technology CO., LTD.
Technical Support
Visit Yealink WIKI ( for firmware downloads, product documents, FAQ, and more. For better service, we
sincerely recommend you to use Yealink Ticketing system ( to submit all your technical issues.
Addr: 309, 3th Floor, No.16, Yun Ding North Road,
Huli District, Xiamen City, Fujian, P.R. China
Copyright©2017Yealink Inc.All right reserved.