Yealink SIP-T2 Series Service manual

Copyright © 2016 YEALINK(XIAMEN) NETWORK TECHNOLOGY CO., LTD.
Copyright © 2016 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. Under the law, reproducing
includes translating into another language or format.
When this publication is made available on media, Yealink(Xiamen) 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(Xiamen) 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(XIAMEN) 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(Xiamen) 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.
For SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T27G/T23P/T23G/T21(P) E2/T19(P) E2/CP860 IP phones:
This device is marked with the CE mark in compliance with EC Directives 2014/35/EU and 2014/30/EU.
For SIP VP-T49G IP phones:
This device is marked with the CE mark in compliance with R&TTE Directive 1999/5/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 VP-T49G, SIP-T48G, SIP-T46G, SIP-T42G, SIP-T41P, SIP-T40P, 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 the basic and advanced features available on IP
phones.
Auto Provisioning Guide, which describes how to provision IP phones using the
configuration files.
Description of Configuration Parameters in CFG Files, which describes all
configuration parameters in 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://support.yealink.com/.
Yealink documentations contain a few typographic 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

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
vi
Convention
Description
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 737), 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_CP860_IP_Phones_Auto_Provisioning_Guide ).
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,
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.
Chapter 6, “Configuring Video Features” describes how to configure the video
features on IP phones.
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.

About This Guide
vii
Chapter 9, “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.
Documentations of the newly released SIP-T27G IP phones have been added.
Major updates have occurred to the following sections:
Transport Layer Security on page 822
Appendix C: Trusted Certificates on page 908
The following section is new for this version:
Onscreen Keyboard Input Method Customization on page 197
Major updates have occurred to the following sections:
Reading Icons on page 39
Obtaining Configuration Files and Resource Files on page 52
Configuring Transmission Methods of the Internet Port and PC Port on page 87
Wi-Fi on page 131
Customizing Softkey Layout Template File on page 212
Customizing a Local Contact File (Color Screen Phones) on page 263
Recent Call In Dialing on page 408
Bandwidth on page 473
External Monitor on page 479
Shared Call Appearance (SCA) on page 538
VQ-RTCPXR on page 677
Sending Volume on page 763
Audio Codecs on page 766
Video Codecs on page 800

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
viii
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file on
page 929
The following section is new for this version:
Exporting All the Diagnostic Files on page 883
Major updates have occurred to the following sections:
Expansion Module on page 17
Connecting the Handset and Optional Headset (not Applicable to CP860 IP Phones)
on page 28
Connecting the Power and Network on page 30
Configuring Transmission Methods of the Internet Port and PC Port on page 87
Power Indicator LED on page 103
Contrast on page 111
Backlight on page 123
Incoming Intercom Calls on page 450
Busy Lamp Field (BLF) on page 506
Voice Quality Monitoring on page 674
Sending Volume on page 763
Capturing Packets on page 870
Major updates have occurred to the following sections:
Verifying Startup on page 38
Reading Icons on page 39
Incoming Intercom Calls on page 450
Documentations of the newly released SIP VP-T49G IP phones have also been added.
The following sections are new for this version:
Answer By Hand on page 472
Bandwidth on page 473
Screenshot and Recording on page 476

About This Guide
ix
Reserved Ports on page 701
Configuring Video Features on page 791
Getting Information from Talk Statistics on page 878
Major updates have occurred to the following sections:
Connecting the IP Phones on page 19
Wi-Fi on page 131
Customizing Softkey Layout Template File on page 212
Customizing a Directory Template File on page 248
Voice Quality Monitoring on page 674
Quality of Service on page 695
TR-069 Device Management on page 719
Audio Codecs on page 766
Capturing Packets on page 870
Troubleshooting Solutions on page 884
Appendix B: Time Zones on page 907
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file on
page 929
This version is updated to incorporate CP860 IP phones. Documentations of the newly
released SIP-T40P IP phones have also been added. The following sections are new for
this version:
Conventions Used in Yealink Documentations on page v
Wi-Fi on page 131
Major updates have occurred to the following sections:
Expansion Module on page 17
Power Indicator LED on page 103
Contrast on page 111
Backlight on page 123
Bluetooth on page 128
Auto Answer on page 288
Session Timer on page 338
Dialog Info Call Pickup on page 405
Methods of Transmitting DTMF Digit on page 431

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
x
Busy Lamp Field (BLF) on page 506
Multicast Paging on page 561
Action URI on page 619
VPN on page 669
Quality of Service on page 695
NAT Traversal on page 706
IPv6 Support on page 725
Distinctive Ring Tones on page 742
Viewing Log Files on page 853
Troubleshooting Solutions on page 884
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file on
page 929
Documentations of the newly released SIP-T19(P) E2 IP phones have also been added.
The following sections are new for this version:
Ringing Timeout on page 454
Shared Call Appearance (SCA) on page 538
Bridge Lines Appearance (BLA) on page 551
Short Message Service (SMS) on page 560
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file on
page 929
Major updates have occurred to the following sections:
Documentations on page v
Expansion Module on page 15
Reading Icons on page 39
Configuration Files on page 48
Obtaining Configuration Files and Resource Files on page 52
Account Registration on page 142
Auto Answer on page 288
IP Direct Auto Answer on page 295
Do Not Disturb (DND) on page 312
Return Code When Refuse on page 330
Call Forward on page 348