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
mechanical, photocopying, recording, or otherwise, for any purpose, without the express written
permission of Yealink Network Technology CO., LTD. Under the law, reproducing includes
translating into another language or format.
When this publication is made available on media, Yealink Network Technology CO., LTD. gives
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 deploy Yealink IP phones
with Lync Server. 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 and T22(P) 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.
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 the IP phones running Lync
firmware version 7 or higher. The firmware format is like x.x.x.x.rom. The second x from
left must be greater than or equal to 7 (e.g., the firmware version of SIP-T22P IP phone:
7.7.0.50.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,
configuration methods and resource files.
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
advanced features on IP phones.
Chapter 5, “Configuring Audio Features” describes how to configure the audio
features on IP phones.

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Chapter 6, “Configuring Security Features” describes how to configure the security
features on IP phones.
Chapter 7, “Troubleshooting” describes how to troubleshoot IP phones and
provides some common troubleshooting solutions.
Chapter 8, “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.
Major update has occurred to the following section:
Viewing Log Files on page 237

Table of Contents
vii
About This Guide ...................................................................... v
Documentations...............................................................................................................................v
In This Guide ....................................................................................................................................v
Summary of Changes ....................................................................................................................vi
Changes for Release 70, Guide Version 70.50......................................................................vi
Table of Contents ....................................................................vii
Product Overview..................................................................... 1
VoIP Principle....................................................................................................................................1
SIP Components...............................................................................................................................2
SIP IP Phone Models........................................................................................................................3
Physical Features of IP Phones ................................................................................................3
Key Features of IP Phones........................................................................................................6
Getting Started......................................................................... 9
Connecting the IP Phones ...............................................................................................................9
Initialization Process Overview ....................................................................................................13
Verifying Startup ............................................................................................................................14
Reading Icons ................................................................................................................................15
Configuration Methods................................................................................................................. 17
Phone User Interface..............................................................................................................17
Web User Interface ................................................................................................................17
Configuration Files..................................................................................................................18
Obtaining Configuration Files and Resource Files .....................................................................19
Provisioning Server........................................................................................................................ 20
Supported Provisioning Protocols .........................................................................................20
Setting up the Provisioning Server........................................................................................21
Deploying Phones from the Provisioning Server .................................................................21
Configuring Basic Network Parameters ......................................................................................22
DHCP .......................................................................................................................................23
DHCP Option...........................................................................................................................27
Configuring Network Parameters Manually ........................................................................ 34
PPPoE .......................................................................................................................................40
Configuring Transmission Methods of the Internet Port and PC Port .................................43
Configuring PC Port Mode.....................................................................................................46

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Upgrading Firmware.....................................................................................................................51
Upgrading Firmware via Web User Interface .....................................................................52
Upgrading Firmware from the Provisioning Server ............................................................52
Updating Phone Firmware from Microsoft Lync Server......................................................57
Configuring Basic Features .................................................... 61
Power Indicator LED ......................................................................................................................62
Backlight.........................................................................................................................................65
Sign-in.............................................................................................................................................69
Web Server Type............................................................................................................................73
Time and Date ...............................................................................................................................76
NTP Time Server .....................................................................................................................77
Time and Date Settings .........................................................................................................81
Daylight Saving Time .............................................................................................................85
Language .......................................................................................................................................92
Loading Language Packs ...................................................................................................... 93
Specifying the Language to Use...........................................................................................96
Logo Customization.......................................................................................................................98
Customizing a Logo Template File ........................................................................................99
Configuring the Logo Shown on the Idle Screen............................................................... 100
Key as send..................................................................................................................................102
Dial Plan........................................................................................................................................107
Dial-now ................................................................................................................................108
Save Call Log...............................................................................................................................110
Missed Call Log ...........................................................................................................................112
Dial Search Delay........................................................................................................................ 113
Live Dialpad.................................................................................................................................115
Call Waiting.................................................................................................................................. 117
Redial Tone...................................................................................................................................120
Ringer Device for Headset .........................................................................................................121
Auto Answer.................................................................................................................................122
Always On Line............................................................................................................................125
Allow Mute ...................................................................................................................................127
Busy Tone Delay...........................................................................................................................128
Return Code When Refuse ..........................................................................................................129
Early Media.................................................................................................................................. 131
180 Ring Workaround ..................................................................................................................131
Call Hold.......................................................................................................................................132
Call Number Filter........................................................................................................................134
DTMF.............................................................................................................................................136
Suppress DTMF Display.......................................................................................................138
Transfer via DTMF.................................................................................................................140
Play Local DTMF Tone ..........................................................................................................142
Voice Mail without PIN ................................................................................................................143

Table of Contents
ix
E911 Location Tip .........................................................................................................................145
Boss/Admin Light ......................................................................................................................... 146
BToE............................................................................................................................................... 148
Configuring Advanced Features...........................................151
VLAN .............................................................................................................................................151
LLDP .......................................................................................................................................151
CDP ........................................................................................................................................153
Manual Configuration for VLAN..........................................................................................155
DHCP VLAN ...........................................................................................................................160
Voice Quality Monitoring ............................................................................................................162
Quality of Service ........................................................................................................................163
SNMP ............................................................................................................................................166
IPv6 Support ................................................................................................................................. 170
Configuring Audio Features ..................................................179
Ring Tones ....................................................................................................................................179
Tones .............................................................................................................................................183
Headset Prior ...............................................................................................................................190
Dual Headset...............................................................................................................................191
Audio Codecs ..............................................................................................................................193
Acoustic Clarity Technology........................................................................................................199
Acoustic Echo Cancellation ................................................................................................. 199
Background Noise Suppression..........................................................................................200
Automatic Gain Control .......................................................................................................200
Voice Activity Detection .......................................................................................................200
Comfort Noise Generation ..................................................................................................202
Jitter Buffer ............................................................................................................................204
Configuring Security Features...............................................207
User Password .............................................................................................................................207
Administrator Password ..............................................................................................................209
Auto-Logout Time.........................................................................................................................210
Phone Lock ...................................................................................................................................212
Account Lock ................................................................................................................................213
Transport Layer Security.............................................................................................................. 215
Encrypting Configuration Files ...................................................................................................224
802.1X Authentication .................................................................................................................227
Troubleshooting.....................................................................237
Troubleshooting Methods ...........................................................................................................237

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Viewing Log Files..................................................................................................................237
Capturing Packets ................................................................................................................241
Enabling Watch Dog Feature ..............................................................................................244
Getting Information from Status Indicators........................................................................245
Analyzing Configuration File ...............................................................................................246
Troubleshooting Solutions ...........................................................................................................247
Why is the LCD screen blank? .............................................................................................248
Why doesn’t the IP phone get an IP address? ...................................................................248
How do I find the basic information of the IP phone?.......................................................248
Why doesn’t the IP phone upgrade firmware successfully?.............................................248
Why doesn’t the IP phone display time and date correctly? ...........................................249
Why do I get poor sound quality during a call? ................................................................249
Why does the IP phone use DOB format logo file instead of popular BMP, JPG and so on?
................................................................................................................................................249
How to increase or decrease the volume?........................................................................ 249
What will happen if I connect both PoE cable and power adapter? Which has the higher
priority?..................................................................................................................................250
What is auto provisioning? ..................................................................................................250
What is PnP? ..........................................................................................................................250
Why doesn’t the IP phone update the configuration? ......................................................250
How to solve the IP conflict problem? ................................................................................250
How to reset the IP phone to factory configurations?.......................................................251
How to restore the administrator password? ....................................................................251
Why does the IP phone play the local ringback tone instead of media when placing a
long distance number without plus 0?................................................................................251
What is the difference between enabling and disabling the RFC 2543 Hold feature?.252
How can I verify the generation and firmware of the phone? ........................................253
Appendix ...............................................................................255
Appendix A: Glossary.................................................................................................................255
Appendix B: Time Zones.............................................................................................................257
Appendix C: Trusted Certificates ...............................................................................................259
Appendix E: SIP (Session Initiation Protocol) ............................................................................260
SIP Request............................................................................................................................261
SIP Header ............................................................................................................................ 261
SIP Responses .......................................................................................................................263
SIP Session Description Protocol (SDP) Usage ..................................................................265
Appendix F: SIP Call Flows .........................................................................................................266
Successful Call Setup and Disconnect ...............................................................................266
Unsuccessful Call Setup—Called User is Busy ..................................................................269
Unsuccessful Call Setup—Called User Does Not Answer ................................................271
Successful Call Setup and Call Hold.................................................................................. 273
Successful Call Setup and Call Waiting .............................................................................276
Call Transfer without Consultation ......................................................................................281

Table of Contents
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Call Transfer with Consultation............................................................................................285
Always Call Forward............................................................................................................290
Busy Call Forward ................................................................................................................293
No Answer Call Forward .....................................................................................................297
Call Conference.................................................................................................................... 300
Index ......................................................................................305

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Product Overview
1
This chapter contains the following information about IP phones:
VoIP Principle
SIP Components
SIP IP Phone Models
VoIP
VoIP (Voice over Internet Protocol) is a technology using the Internet Protocol instead of
traditional Public Switch Telephone Network (PSTN) technology for voice
communications.
It is a family of technologies, methodologies, communication protocols, and
transmission techniques for the delivery of voice communications and multimedia
sessions over IP networks. The H.323 and Session Initiation Protocol (SIP) are two
popular VoIP protocols that are found in widespread implementation.
H.323
H.323 is a recommendation from the ITU Telecommunication Standardization Sector
(ITU-T) that defines the protocols to provide audio-visual communication sessions on
any packet network. The H.323 standard addresses call signaling and control,
multimedia transport and control, and bandwidth control for point-to-point and
multi-point conferences.
It is widely implemented by voice and video conference equipment manufacturers, is
used within various Internet real-time applications such as GnuGK and NetMeeting and
is widely deployed by service providers and enterprises for both voice and video
services over IP networks.
SIP
SIP (Session Initiation Protocol) is the Internet Engineering Task Force’s (IETF’s) standard
for multimedia conferencing over IP. It is an ASCII-based, application-layer control
protocol (defined in RFC 3261) that can be used to establish, maintain, and terminate
calls between two or more endpoints. Like other VoIP protocols, SIP is designed to
address functions of signaling and session management within a packet telephony
network. Signaling allows call information to be carried across network boundaries.
Session management provides the ability to control attributes of an end-to-end call.

Microsoft Lync Edition Administrator’s Guide for SIP-T2_Series and T4_Series IP Phones
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SIP provides capabilities to:
Determine the location of the target endpoint -- SIP supports address resolution,
name mapping, and call redirection.
Determine media capabilities of the target endpoint -- Via Session Description
Protocol (SDP), SIP determines the “lowest level” of common services between
endpoints. Conferences are established using only media capabilities that can be
supported by all endpoints.
Determine the availability of the target endpoint -- A call cannot be completed
because the target endpoint is unavailable, SIP determines whether the called
party is already on the IP phone or does not answer in the allotted number of rings.
It then returns a message indicating why the target endpoint is unavailable.
Establish a session between the origin and target endpoint -- The call can be
completed, SIP establishes a session between endpoints. SIP also supports mid-call
changes, such as the addition of another endpoint to the conference or the change
of a media characteristic or codec.
Handle the transfer and termination of calls -- SIP supports the transfer of calls from
one endpoint to another. During a call transfer, SIP simply establishes a session
between the transferee and a new endpoint (specified by the transferring party)
and terminates the session between the transferee and the transferring party. At
the end of a call, SIP terminates the sessions between all parties.
SIP is a peer-to-peer protocol. The peers in a session are called User Agents (UAs). A
user agent can function as one of following roles:
User Agent Client (UAC) -- A client application that initiates the SIP request.
User Agent Server (UAS) -- A server application that contacts the user when a SIP
request is received and that returns a response on behalf of the user.
User Agent Client (UAC)
The UAC is an application that initiates up to six feasible SIP requests to the UAS. The six
requests issued by the UAC are: INVITE, ACK, OPTIONS, BYE, CANCEL and REGISTER.
When the SIP session is being initiated by the UAC SIP component, the UAC determines
the information essential for the request, which is the protocol, the port and the IP
address of the UAS to which the request is being sent. This information can be dynamic
and will make it challenging to put through a firewall. For this reason, it may be
recommended to open the specific application type on the firewall. The UAC is also
capable of using the information in the request URI to establish the course of the SIP
request to its destination, as the request URI always specifies the host which is essential.
The port and protocol are not always specified by the request URI. Thus if the request
does not specify a port or protocol, a default port or protocol is contacted. It may be

Product Overview
3
preferential to use this method when not using an application layer firewall. Application
layer firewalls like to know what applications are flowing through which ports and it is
possible to use content types of other applications other than the one you are trying to
let through what has been denied.
User Agent Server (UAS)
UAS is a server that hosts the application responsible for receiving the SIP requests from
a UAC, and on reception it returns a response to the request back to the UAC. The UAS
may issue multiple responses to the UAC, not necessarily a single response.
Communication between UAC and UAS is client/server and peer-to–peer.
Typically, a SIP endpoint is capable of functioning as both a UAC and a UAS, but it
functions only as one or the other per transaction. Whether the endpoint functions as a
UAC or a UAS depends on the UA that initiates the request.
This section introduces SIP-T48G and SIP-T22(P) IP phone models with Lync firmware. It is
designed to work with Microsoft®Lync™ 2013. These IP phones are characterized by a
large number of functions, which simplify business communication with a high standard
of security.
SIP-T48G and SIP-T22(P) IP phones provide a powerful and flexible IP communication
solution for Ethernet TCP/IP networks, delivering excellent voice quality. When these IP
phones are registered with Microsoft®Lync™ server, you can interact with your Lync
contacts list on your IP phones through Microsoft’s Active Directory.
The following IP phone models are described:
SIP-T48G
SIP-T22(P)
For a list of key features available on Yealink IP phones running the latest firmware, refer
to Key Features of IP Phones on page 6.
In order to operate as SIP endpoints in your network successfully, IP phones must meet
the following requirements:
A working IP network is established.
VoIP gateways are configured for SIP.
The latest (or compatible) firmware of IP phones is available.
The Lync server is active and configured to receive and send SIP messages.
This section lists the available physical features of SIP-T48G and SIP-T22(P) IP phones.

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SIP-T48G
Physical Features:
-7” 800 x 480 pixel color touch screen with backlight
-24 bit depth color
-1 VoIP account, Microsoft®LyncTM Compatible
-HD Voice: HD Codec, HD Handset, HD Speaker
-26 keys including 7 feature keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100/1000Mbps Ethernet ports
-1*RJ12 (6P6C) expansion module port
-4 LEDs: 1*power, 1*mute, 1*headset, 1*speakerphone
-Power adapter: AC 100~240V input and DC 5V/2A output
-Power over Ethernet (IEEE 802.3af)
-Built-in USB port, support Bluetooth headset
-Wall Mount

Product Overview
5
SIP-T22(P)
Physical Features:
-TI TITAN chipset and TI voice engine
-132 x 64 graphic LCD
-1 VoIP account, Microsoft®LyncTM Compatible
-HD Voice: HD Codec, HD Handset, HD Speaker
-32 keys including 4 soft keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100Mbps Ethernet ports
-5 LEDs: 1*power, 3*line, 1*message
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)
-Wall Mount

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In addition to physical features introduced above, IP phones also support the following
key features when running the latest firmware:
Phone Features
-Call Options: call waiting, call hold, call mute, call forward, call transfer.
-Basic Features: DND, live dialpad, dial plan, caller identity, auto answer.
Codecs and Voice Features
-Wideband codec: G.722
-Narrowband codec: G.711, G.726, G.729, iLBC, G723
-VAD, CNG, AEC, PLC, AJB, AGC
-Full-duplex speakerphone with AEC
Network Features
-SIP v1 (RFC2543), v2 (RFC3261)
-Proxy mode and peer-to-peer SIP link mode
-IP assignment: Static/DHCP/PPPoE
-VLAN assignment: LLDP/Static/DHCP/CDP
-Bridge and Router mode for PC port (Router mode is only applicable to
SIP-T22(P) IP phones)
-HTTP/HTTPS server
-DNS client
-DHCP server
-IPv6 support
Management
-FTP/TFTP/HTTP/PnP auto-provision
-Configuration: browser/phone/auto-provision
-Dial number via SIP server
-Dial URL via SIP server
-TR-069
Security
-HTTPS (server/client)
-Transport Layer Security (TLS)
-VLAN (802.1q), QoS
-Digest authentication using MD5/MD5-sess
-Secure configuration file via AES encryption
-Phone lock for personal privacy protection

Product Overview
7
-Admin/User configuration mode
-802.1X authentication

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