Yealink Yealink SIP-T48G Service manual

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Copyright © 2015 YEALINK NETWORK TECHNOLOGY
Copyright © 2015 Yealink 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
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its consent to downloading and printing copies of the content provided in this file only for private
use but not for redistribution. No parts of this publication may be subject to alteration,
modification or commercial use. Yealink Network Technology CO., LTD. will not be liable for any
damages arising from use of an illegally modified or altered publication.
THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS GUIDE ARE
SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND
RECOMMENDATIONS IN THIS GUIDE ARE BELIEVED TO BE ACCURATE AND PRESENTED
WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL
RESPONSIBILITY FOR THEIR APPLICATION OF PRODUCTS.
YEALINK NETWORK TECHNOLOGY CO., LTD. MAKES NO WARRANTY OF ANY KIND WITH
REGARD TO THIS GUIDE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Yealink Network Technology
CO., LTD. shall not be liable for errors contained herein nor for incidental or consequential
damages in connection with the furnishing, performance, or use of this guide.
Hereby, Yealink Network Technology CO., LTD. declares that this phone is in conformity
with the essential requirements and other relevant provisions of the CE, FCC.
This device is marked with the CE mark in compliance with EC Directives 2006/95/EC and 2004/108/EC.
Any Changes or modifications not expressly approved by the party responsible for compliance could void
the user's authority to operate the equipment.

This device is compliant with Part 15 of the FCC Rules. Operation is subject to the following two conditions:
1. This device may not cause harmful interference.
2. This device must accept any interference received, including interference that may cause undesired
operation.
Note: This device is tested and complies with the limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a
residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not
installed and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a particular installation. If
this equipment does cause harmful interference to radio or television reception, which can be determined
by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more
of the following measures:
1. Reorient or relocate the receiving antenna.
2. Increase the separation between the equipment and receiver.
3. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
4. Consult the dealer or an experience radio/TV technician for help.
To avoid the potential effects on the environment and human health as a result of the
presence of hazardous substances in electrical and electronic equipment, end users of
electrical and electronic equipment should understand the meaning of the crossed-out
wheeled bin symbol. Do not dispose of WEEE as unsorted municipal waste and have to
collect such WEEE separately.
We are striving to improve our documentation quality and we appreciate your feedback. Email
your opinions and comments to [email protected].

Yealink IP phone firmware contains third-party software under the GNU General Public License (GPL).
Yealink uses software under the specific terms of the GPL. Please refer to the GPL for the exact terms and
conditions of the license.
The original GPL license, source code of components licensed under GPL and used in Yealink products can
be downloaded from Yealink web site:
http://www.yealink.com/GPLOpenSource.aspx?BaseInfoCateId=293&NewsCateId=293&CateId=293.

About This Guide
v
This guide is intended for administrators who need to properly configure, customize,
manage, and troubleshoot the IP phone system rather than end-users. It provides
details on the functionality and configuration of IP phones.
Many of the features described in this guide involve network settings, which could affect
the IP phone’s performance in the network. So an understanding of IP networking and a
prior knowledge of IP telephony concepts are necessary.
This guide covers SIP-T48G, SIP-T46G, T42G, T41P, T29G, T27P, T23P/G and T21(P) E2 IP
phones. The following related documents are available:
Quick Start Guides, which describe how to assemble IP phones and configure the
most basic features available on IP phones.
User Guides, which describe the basic and advanced features available on IP
phones.
Auto Provisioning Guide, which describes how to provision IP phones using the
configuration files.
<y0000000000xx>.cfg and <MAC>.cfg template configuration files.
IP Phones Deployment Guide for BroadSoft UC-One Environments, which describes
how to configure BroadSoft features on the BroadWorks web portal and IP phones.
For support or service, please contact your Yealink reseller or go to Yealink Technical
Support online: http://www.yealink.com/Support.aspx.
The information detailed in this guide is applicable to firmware version 80 or higher. The
firmware format is like x.x.x.x.rom. The second x from left must be greater than or equal
to 80 (e.g., the firmware version of SIP-T23G IP phone: [phone].rom). This administrator
guide includes the following chapters:
Chapter 1, “Product Overview” describes the SIP components and SIP IP phones.
Chapter 2, “Getting Started” describes how to install and connect IP phones and
the configuration methods.
Chapter 3, “Configuring Basic Features” describes how to configure the basic
features on IP phones.
Chapter 4, “Configuring Advanced Features” describes how to configure the

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
vi
advanced features on IP phones.
Chapter 5, “Configuring Audio Features” describes how to configure the audio
features on IP phones.
Chapter 6, “Configuring Security Features” describes how to configure the security
features on IP phones.
Chapter 7, “Resource Files” describes the resource files that can be downloaded
by IP phones.
Chapter 9, “Troubleshooting” describes how to troubleshoot IP phones and
provides some common troubleshooting solutions.
Chapter 10, “Appendix” provides the glossary, reference information about IP
phones compliant with RFC 3261, SIP call flows and the sample configuration files.
This section describes the changes to this guide for each release and guide version.
This version is updated to incorporate SIP-T48G IP phones. Documentations of the newly
released SIP-T27P and SIP-T21(P) E2 IP phones have also been added.
Major updates have occurred to the following sections:
Reading Icons on page 23
Configuration Files on page 26
Power Indicator LED on page 58
Backlight on page 70
Phone Lock on page 84
Time and Date on page 92
Auto Answer on page 167
Return Code When Refuse on page 193
DTMF on page 265
Appendix B: Time Zones on page 547
This version is updated to incorporate SIP-T46G, SIP-T42G, SIP-T41P and SIP-T29G IP
phones. The following sections are new for this version:
Wallpaper on page 66

About This Guide
vii
Hide Features Access Code on page 329
Major updates have occurred to the following sections:
DHCP on page 30
Call Display on page 74
Input Method Customization on page 113
BLF List on page 322
IPv6 Support on page 464
Viewing Log Files on page 523

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
viii

Table of Contents
ix
About This Guide ...................................................................... v
Documentations...............................................................................................................................v
In This Guide ....................................................................................................................................v
Summary of Changes .................................................................................................................... vi
Changes for Release 80, Guide Version 80.20...................................................................... vi
Changes for Release 80, Guide Version 80.6........................................................................ vi
Table of Contents .................................................................... ix
Product Overview..................................................................... 1
VoIP Principle....................................................................................................................................1
SIP Components...............................................................................................................................2
SIP IP Phone Models........................................................................................................................3
Physical Features of IP Phones ................................................................................................4
Key Features of IP Phones......................................................................................................12
Getting Started....................................................................... 15
Connecting the IP Phones .............................................................................................................15
Initialization Process Overview ....................................................................................................21
Verifying Startup ............................................................................................................................22
Reading Icons ................................................................................................................................23
Configuration Methods................................................................................................................. 25
Phone User Interface..............................................................................................................26
Web User Interface ................................................................................................................26
Configuration Files..................................................................................................................26
Provisioning Server........................................................................................................................ 28
Supported Provisioning Protocols .........................................................................................28
Setting up the Provisioning Server........................................................................................28
Deploying Phones from the Provisioning Server ................................................................. 29
Configuring Basic Network Parameters ......................................................................................30
DHCP .......................................................................................................................................30
Configuring Network Parameters Manually ........................................................................35
PPPoE .......................................................................................................................................41
Configuring Transmission Methods of the Internet Port and PC Port .................................44
Configuring PC Port Mode.....................................................................................................47
Upgrading Firmware.....................................................................................................................49

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
x
Configuring Basic Features .................................................... 57
Power Indicator LED ......................................................................................................................58
Notification Popups........................................................................................................................62
Contrast ..........................................................................................................................................65
Wallpaper.......................................................................................................................................66
Backlight.........................................................................................................................................70
Call Display ....................................................................................................................................74
Web Server Type............................................................................................................................77
User Password ...............................................................................................................................80
Administrator Password ................................................................................................................82
Phone Lock .....................................................................................................................................84
Time and Date ...............................................................................................................................92
Language .....................................................................................................................................104
Loading Language Packs .................................................................................................... 104
Specifying the Language to Use.........................................................................................111
Input Method Customization ...................................................................................................... 113
Logo Customization.....................................................................................................................118
Softkey Layout..............................................................................................................................121
Key as send..................................................................................................................................127
Dial Plan........................................................................................................................................131
Replace Rule .........................................................................................................................132
Dial-now ................................................................................................................................135
Area Code.............................................................................................................................139
Block Out ...............................................................................................................................142
Hotline ..........................................................................................................................................144
Off Hook Hot Line Dialing...........................................................................................................146
Directory .......................................................................................................................................148
Search Source in Dialing.............................................................................................................149
Call Log.........................................................................................................................................151
Missed Call Log ...........................................................................................................................153
Local Directory .............................................................................................................................154
Live Dialpad.................................................................................................................................159
Call Waiting.................................................................................................................................. 161
Auto Redial...................................................................................................................................165
Auto Answer.................................................................................................................................167
Call Completion...........................................................................................................................171
Anonymous Call........................................................................................................................... 172
Anonymous Call Rejection ..........................................................................................................177
Do Not Disturb..............................................................................................................................180
Busy Tone Delay...........................................................................................................................191
Return Code When Refuse ..........................................................................................................193
Early Media.................................................................................................................................. 194
180 Ring Workaround ..................................................................................................................194