Yealink SIP-T2 Series Service manual

63

Copyright
Copyright © 2017 YEALINK(XIAMEN) NETWORK TECHNOLOGY
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,
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All other trademarks belong to their respective owners. Without Yealink’s express written permission,
recipient shall not reproduce or transmit any portion hereof in any form or by any means, with any
purpose other than personal use.
Warranty
(1) Warranty
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.
(2) Disclaimer
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REGARD TO THIS GUIDE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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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.
(3) Limitation of Liability
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in this document for any reason. The information is provided “as is”, and Yealink does not provide any
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limited to loss of business profit, business interruption or loss of business information), shall not be liable
for these damages.
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This End User License Agreement ("EULA") is a legal agreement between you and Yealink. By installing,
copying or otherwise using the Products, you: (1) agree to be bounded by the terms of this EULA, (2) you
are the owner or an authorized user of the device, and (3) you represent and warrant that you have the
right, authority and capacity to enter into this agreement and to abide by all its terms and conditions, just
as if you had signed it. The EULA for this product is available on the Yealink Support page for the product.
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accompanying products and/or patents being applied by Yealink.
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We are striving to improve our documentation quality and we appreciate your feedback. Email your
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Visit Yealink WIKI (http://support.yealink.com/) for the latest firmware, guides, FAQ, Product documents,
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(https://ticket.yealink.com) to submit all your technical issues.

GNU GPL INFORMATION
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.

Introduction
v
Introduction
About This Guide
Yealink administrator guide is intended for administrators who need to properly configure,
customize, manage, and troubleshoot the IP phone system rather than end-users. This guide will
help you understand the Voice over Internet Protocol (VoIP) network and Session Initiation
Protocol (SIP) components, and provides descriptions of all available phone features.
This guide describes three methods for configuring IP phones: central provisioning, web user
interface and phone user interface. It will help you perform the following tasks:
Configure your IP phone on a provisioning server
Configure your phone’s features and functions via web/phone user interface
Troubleshoot some common phone issues
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.
The information detailed in this guide is applicable to firmware version 81 or higher. The
firmware format is like x.x.x.x.rom. The second x from left must be greater than or equal to 81
(e.g., the firmware version of SIP-T46G IP phone: [phone].rom).
See the Yealink Products Regulatory Notices guide for all regulatory and safety guidance.
Chapters in This Guide
This administrator guide includes the following chapters:
Chapter 1, “Product Overview” describes the SIP IP phones and expansion modules.
Chapter 2, “Getting Started” describes how Yealink phones fit in your network and how to
install and connect IP phones, and also gives you an overview of IP phone’s initialization
process.
Chapter 3, “Setting Up Your System”describes some essential information on how to set
up your phone network and set up your phone with a provisioning server.
Chapter 4, “Configuring Basic Features” describes how to configure the basic features on IP
phones.
Chapter 5, “Configuring Advanced Features” describes how to configure the advanced
features on IP phones.
Chapter 6, “Configuring Audio Features” describes how to configure the audio features on
IP phones.

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Chapter 7, “Configuring Security Features” describes how to configure the security features
on IP phones.
Chapter 8, “Troubleshooting” describes how to troubleshoot IP phones and provides some
common troubleshooting solutions.
Chapter 9, “Appendix” provides the glossary, time zones, trusted certificates, auto
provisioning flowchart, reference information about IP phones compliant with RFC 3261,
SIP call flows and some other function lists (e.g., DSS keys, reading icons).
Related Documentations
This guide covers SIP-T54S, SIP-T52S, SIP-T48G/S, SIP-T46G/S, SIP-T42G/S, SIP-T41P/S,
SIP-T40P/G, SIP-T29G, SIP-T27P/G, SIP-T23P/G, SIP-T21(P) E2, SIP-T19(P) E2 and CP860 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 how to configure and use the basic and advanced features
available on IP phones via phone user interface.
Auto Provisioning Guide, which describes how to provision IP phones using the boot file
and configuration files.
The purpose of Auto Provisioning Guide is to serve as a basic guidance for provisioning Yealink
IP phones with a provisioning server. If you are new to this process, it is helpful to read this
guide.
Description of Configuration Parameters in CFG Files, which describes all configuration
parameters in configuration files.
Note that Yealink administrator guide contains most of parameters. If you want to find out more
parameters which are not listed in this guide, please refer to Description of Configuration
Parameters in CFG Files guide.
y000000000000.boot template boot file.
<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.
IP Phone Features Integrated with BroadSoft UC-One User Guide, which describes how to
configure and use IP phone features integrated with BroadSoft UC-One on Yealink IP
phones.
When the SIP server type is set to BroadSoft, please refer to these two guides to have a better
knowledge of configuring and using features integrated with Broadsoft UC-One.
For support or service, please contact your Yealink reseller or go to Yealink Technical Support
online: http://support.yealink.com/.

Introduction
vii
Conventions Used in Yealink Documentations
Yealink documentations contain a few typographic conventions and writing conventions.
You need to know the following basic typographic conventions to distinguish types of in-text
information:
Convention
Description
Bold
Highlights the web/phone user interface items such as menus,
menu selections, soft keys, or directory names when they are
involved in a procedure or user action (e.g., Click on
Settings->Upgrade.).
Also used to emphasize text (e.g., Important!).
Italics
Used to show the format of examples (e.g., http(s)://[IPv6
address] ), or to show the title of a section in the reference
documentations available on the Yealink Technical Support
Website (e.g., Triggering the IP phone to Perform the Auto
Provisioning ).
Blue Text
Used for cross references to other sections within this
documentation (e.g., refer to Ring Tones on page 809), for
hyperlinks to non-Yealink websites (e.g., RFC 3315) or for
hyperlinks to Yealink Technical Support website.
Blue Text in Italics
Used for hyperlinks to Yealink resources outside of this
documentation such as the Yealink documentations (e.g.,
Yealink_SIP-T2_Series_T19(P)
E2_T4_Series_T5_Series_W5_Series_CP860_IP_Phones_Auto_Provisi
oning_Guide_V81 ).
You also need to know the following writing conventions to distinguish conditional information:
Convention
Description
<>
Indicates that you must enter information specific to phone or
network. For example, when you see <MAC>, enter your phone’s
12-digit MAC address. If you see <phoneIPAddress>, enter your
phone’s IP address.
->
Indicates that you need to select an item from a menu. For
example, Settings->Basic Settings indicates that you need to
select Basic Settings from the Settings menu.
Reading the Configuration Parameter Tables
The feature descriptions discussed in this guide include two tables. One is a summary table of
provisioning methods that you can use to configure the features. The other is a table of details

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viii
of the configuration parameters that you configure to make the features work.
This brief section describes the conventions used in the summary table and configuration
parameter table. In order to read the tables and successfully perform configuration changes, an
understanding of these conventions is necessary.
Summary Table Format
The following summary table indicates three provisioning methods (central provisioning, web
user interface and phone user interface, refer to Provisioning Methods for more information)
you can use to configure a feature. Note that the types of provisioning methods available for
each feature will vary; not every feature uses all these three methods.
The central provisioning method requires you to configure parameters located in CFG format
configuration files that Yealink provides. For more information on configuration files, refer to
Configuration Files on page 133. As shown below, the table specifies the configuration file name
and the corresponding parameters. That is, the <MAC>.cfg file contains the
account.X.auto_answer parameter, and the <y0000000000xx>.cfg file contains the
feature.auto_answer_delay parameter.
The web user interface method requires you to configure features by navigating to the specified
link. This navigation URL can help you quickly locate the webpage where you can configure the
feature.

Introduction
ix
Configuration Parameter Table Format
The following configuration parameter table describes the parameter that you can configure to
make the feature (e.g., auto answer) work.
Note
The above table also indicates three methods for configuring the feature.
Method 1: Central Provisioning
This table specifies the details of account.X.auto_answer parameter, which enables or disables
the auto answer feature. This parameter is disabled by default. If you want to enable the auto
answer feature, open the MAC.cfg file and locate the parameter name account.X.auto_answer .
Set the parameter value to “1” to enable the auto answer feature or “0” to disable the auto
answer feature.
Note that some parameters described in this guide contain one or more variables (e.g., X or Y).
But the variables in the parameters described in the CFG file are all replaced with specific value
in the scope of variable. You may need to assign a value to the variable before you search and
Sometimes you will see the words “Refer to the following content” in the Permitted Values or
Default field. It means the permitted value or the default value of the parameter has the model
difference or there are many permitted values of the parameter, you can get more details from
the following Description field.
The word “None”in the Web User Interface or Phone User Interface field means this feature
cannot be configured via web/phone user interface.

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x
locate the specific parameter in the CFG file.
For example, if you want to enable the auto answer feature for account 1, you need to locate the
account.1.auto_answer in the MAC.cfg file and then configure it as required (e.g.,
account.1.auto_answer = 1). If you want to configure the SIP server 1 for account 1, you can
locate the account.1.sip_server.1.address in the MAC.cfg file and configure it as required (e.g.,
account.1.sip_server.1.address = 10.2.1.48).
The following shows a segment of MAC.cfg file:
Method 2: Web User Interface
As described in the chapter Summary Table Format, you can directly navigate to the specified
webpage to configure the feature. You can also first log into the web user interface, and then
locate the feature field according to the web path (e.g., Account->Basic->Auto Answer) to
configure it as required.

Introduction
xi
As shown in the following illustration:
To successfully log into the web user interface, you may need to enter the user name (default:
admin) and password (default: admin). For more information, refer to Web User Interface on
page 130.
Method 3: Phone User Interface
You can configure features via phone user interface. Access to the desired feature according to
the phone path (e.g., Menu->Features->Auto Answer->Line X->Auto Answer) and then
configure it as required.
As shown in the following illustration:
Recommended References
For more information on configuring and administering other Yealink products not included in
this guide, refer to product support page at Yealink Technical Support.
To access the latest Release Notes or other guides for Yealink IP phones, refer to the Document
Download page for your phone at Yealink Technical Support.

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If you want to find Request for Comments (RFC) documents, type
http://www.ietf.org/rfc/rfcNNNN.txt (NNNN is the RFC number) into the location field of your
browser.
This guide mainly takes the SIP-T46G IP phones as example for reference. For more details on
other IP phones, refer to Yealink phone-specific user guide .
For other references, look for the hyperlink or web info throughout this administrator guide.
Understanding VoIP Principle and SIP Components
This section mainly describes the basic knowledge of VoIP principle and SIP components, which
will help you have a better understanding of the phone’s deployment scenarios.
VoIP Principle
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.

Introduction
xiii
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 Components
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
preferential to use this method when not using an application layer firewall. Application layer

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xiv
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.
Summary of Changes
This section describes the changes to this guide for each release and guide version.
Changes for Release 81, Guide Version 81.90
The following section is new for this version:
Ringer Volume on page 841
Major updates have occurred to the following sections:
Physical Features of IP Phones on page 1
Key Features of IP Phones on page 14
Connecting the Optional USB Flash Drive (Only Applicable to
SIP-T54S/T52S/T48G/T48S/T46G/T46S/T42S/T41S/T29G/T27G/CP860 IP Phones) on page
34
Wi-Fi on page 65
Bluetooth on page 205
Call Recording on page 565
Audio Codecs on page 842
Appendix G: Reading Icons on page 1024
Changes for Release 81, Guide Version 81.71
Documentations of the newly released SIP-T54S/T52S, CP860 IP phones and EXP50 color-screen
expansion modules have been added.

Introduction
xv
The following sections are new for this version:
Connecting the Optional Expansion PSTN Box CPN10 (Only Applicable to CP860 IP Phones)
on page 37
Linekey Length in Short on page 216
PSTN Account on page 228
Idle Recording on page 566
Cloud on page 570
Major updates have occurred to the following sections:
Missed Call Log on page 339
Auto Answer on page 377
Call Recording on page 565
Ring Tones on page 810
Changes for Release 81, Guide Version 81.70
Documentations of the newly released SIP-T40G IP phones have been added.
The following sections are new for this version:
Page Switch Key on page 208
Backing up the Call Log on page 335
Major updates have occurred to the following sections:
Upgrading Firmware from the Provisioning Server on page 144
Power Indicator LED on page 167
Label Length on page 213
Call Display on page 237
Directory List on page 327
Search Source List In Dialing on page 330
Missed Call Log on page 339
Customizing a Local Contact File on page 342
Auto Answer on page 377
Do Not Disturb (DND) on page 401
Call Forward on page 437
Call Park on page 508
Lightweight Directory Access Protocol (LDAP) on page 581
Visual Alert and Audio Alert for BLF Pickup on page 601

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Busy Lamp Field (BLF) List on page 625
Receiving RTP Stream on page 682
Action URI on page 729
Ring Tones on page 810
Audio Codecs on page 842
Jitter Buffer on page 870
Transport Layer Security (TLS) on page 921
Local Logging on page 948
Syslog on page 956
Changes for Release 81, Guide Version 81.20
Major updates have occurred to the following sections:
Wallpaper on page 178
Screen Saver on page 188
Changes for Release 81, Guide Version 81.15
Documentations of the newly released SIP-T48S, SIP-T46S, SIP-T42S, SIP-T41S and SIP-T27G IP
phones have been added.
The following section is new for this version:
Transparency on page 185
Major updates have occurred to the following sections:
VPN on page 92
Upgrading Firmware from the Provisioning Server on page 144
Wallpaper on page 178
Screen Saver on page 188
Power Saving on page 195
Backlight on page 200
Account Registration on page 219
Time and Date on page 243
Language on page 261
Customizing Softkey Layout Template File on page 283
Dial Plan using Digit Map String Rules on page 309
Call Number Filter on page 506

Introduction
xvii
Calling Line Identification Presentation (CLIP) on page 522
Intercom on page 533
Lightweight Directory Access Protocol (LDAP) on page 581
Visual Alert and Audio Alert for BLF Pickup on page 601
Server Redundancy on page 739
Audio Codecs on page 842
Methods of Transmitting DTMF Digit on page 874
Appendix C: Trusted Certificates on page 994

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Table of Contents
xix
Table of Contents
Introduction.................................................................................... v
About This Guide ....................................................................................................................................................................... v
Chapters in This Guide............................................................................................................................................................. v
Related Documentations .......................................................................................................................................................vi
Conventions Used in Yealink Documentations ...........................................................................................................vii
Reading the Configuration Parameter Tables..............................................................................................................vii
Summary Table Format...............................................................................................................................................viii
Configuration Parameter Table Format.................................................................................................................. ix
Recommended References ................................................................................................................................................... xi
Understanding VoIP Principle and SIP Components ................................................................................................xii
VoIP Principle ................................................................................................................................................................... xii
SIP Components.............................................................................................................................................................xiii
Summary of Changes ............................................................................................................................................................xiv
Changes for Release 81, Guide Version 81.90...................................................................................................xiv
Changes for Release 81, Guide Version 81.71...................................................................................................xiv
Changes for Release 81, Guide Version 81.70.................................................................................................... xv
Changes for Release 81, Guide Version 81.20...................................................................................................xvi
Changes for Release 81, Guide Version 81.15...................................................................................................xvi
Table of Contents........................................................................xix
Product Overview ..........................................................................1
SIP IP Phone Models.................................................................................................................................................................1
Physical Features of IP Phones....................................................................................................................................1
Key Features of IP Phones.......................................................................................................................................... 14
Expansion Modules ................................................................................................................................................................ 16
Getting Started.............................................................................19
What IP Phones Need to Meet.......................................................................................................................................... 19
Yealink IP Phones in a Network ........................................................................................................................................ 19
Connecting the IP Phones ................................................................................................................................................... 20
Attaching the Stand and the Optional Wall Mount Bracket (not Applicable to CP860 IP Phones)
............................................................................................................................................................................................... 21
Connecting the Handset and Optional Headset (not Applicable to CP860 IP Phones)................... 29
Connecting the Power and Network ..................................................................................................................... 31
Connecting the Optional USB Flash Drive (Only Applicable to

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SIP-T54S/T52S/T48G/T48S/T46G/T46S/T42S/T41S/T29G/T27G/CP860 IP Phones) ......................... 34
Connecting the Optional Expansion Microphones (Only Applicable to CP860 IP Phones) ........... 35
Connecting the Optional PC or Mobile Device (only applicable to CP860 IP phones).................... 36
Connecting the Optional Expansion PSTN Box CPN10 (Only Applicable to CP860 IP Phones)... 37
Initialization Process Overview.......................................................................................................................................... 37
Verifying Startup ..................................................................................................................................................................... 39
Setting Up Your System ..............................................................41
Setting Up Your Phone Network ...................................................................................................................................... 41
DHCP................................................................................................................................................................................... 42
DHCP Option................................................................................................................................................................... 46
Configuring Network Parameters Manually....................................................................................................... 51
Configuring Transmission Methods of the Internet Port and PC Port.................................................... 56
Configuring PC Port Mode ........................................................................................................................................ 60
Web Server Type............................................................................................................................................................ 61
Wi-Fi.................................................................................................................................................................................... 65
VLAN ................................................................................................................................................................................... 71
IPv6 Support .................................................................................................................................................................... 83
VPN...................................................................................................................................................................................... 92
Network Address Translation (NAT) ...................................................................................................................... 95
Quality of Service (QoS)............................................................................................................................................113
802.1X Authentication ...............................................................................................................................................116
Setting Up Your Phones with a Provisioning Server ..............................................................................................127
Provisioning Points to Consider ............................................................................................................................127
Provisioning Methods................................................................................................................................................128
Boot Files, Configuration Files and Resource Files ........................................................................................131
Setting Up a Provisioning Server ..........................................................................................................................140
Upgrading Firmware...................................................................................................................................................143
Keeping User Personalized Settings after Auto Provisioning ...................................................................153
Configuring Basic Features .......................................................165
Power Indicator LED.............................................................................................................................................................167
Notification Popups .............................................................................................................................................................173
Contrast.....................................................................................................................................................................................176
Wallpaper .................................................................................................................................................................................178
Transparency...........................................................................................................................................................................185
Screen Saver............................................................................................................................................................................188
Power Saving ..........................................................................................................................................................................195
Backlight ...................................................................................................................................................................................200
Idle Clock Display..................................................................................................................................................................204
Bluetooth..................................................................................................................................................................................205
Page Switch Key.....................................................................................................................................................................208
Enable Page Tips ...................................................................................................................................................................209