Yealink SIP-T2XP Instruction Manual

Copyright © 2012 YEALINK NETWORK TECHNOLOGY
Copyright © 2012 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 and 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 BUT ARE 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.
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, and
2. This device must accept any interferences 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.

About This Guide
v
The Yealink SIP-T2xP IP Phone Family Administrator Guide is considered to be an
administration-level version, which is intended for administrators who need to properly
configure, customize, manage, and troubleshoot Yealink IP phone systems rather than
the end-users of the IP phones. It includes details on the functioning and configuration of
the IP phones.
Many of the features are described in this guide involving the network settings, which
could affect the phone’s performance in the network. For this reason, an understanding
of IP networking and prior knowledge of IP telephony concepts are recommended.
This guide covers the Yealink SIP-T28P, T26P, T22P and T20P IP phones. The following
related documents for the SIP-T2xP IP phones are available:
Quick Installation Guides, which describe how to assemble the IP phones.
Quick Reference Guides, which describe the most basic features available on the
IP phones.
User Guides, which describe the basic and advanced features available on the IP
phones.
Yealink Auto Provisioning User Guide, which describes how to auto provision the IP
phones using the configuration files.
Yealink Configuration Conversion Tool User Guide, which describes how to encrypt
the configuration files using the Configuration Conversion Tool.
<y0000000000xx>.cfg and <MAC>.cfg template configuration files.
Yealink IP Phones Deployment Guide for BroadWorks Environments, which
describes how to configure the BroadSoft features on the BroadWorks web portal
and the IP phones.
For support or service, please contact your Yealink reseller or go to Yealink Technical
Support at http://www.yealink.com/index.php/Faq/lists/classid/2.
The information detailed in this guide is applicable to the firmware version 70 or higher.
This administrator guide is divided into 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 the Yealink SIP IP

Administrator’s Guide for SIP-T2xP IP Phones
vi
phones and the IP phone interface methods.
Chapter 3, ‖Configuring Basic Features‖describes how to configure the basic
features on the IP phones.
Chapter 4, ―Configuring Advanced Features‖describes how to configure the
advanced features on the IP phones.
Chapter 5, ―Security Features‖describes the encryption information of the IP
phones.
Chapter 6, ―Upgrading the Firmware‖describes how to upgrade the firmware of
the IP phones.
Chapter 7, ―Resource Files‖describes the resource files that can be downloaded
by the IP phones.
Chapter 8, ―Troubleshooting‖describes how to troubleshoot the IP phones and
provides some common troubleshooting solutions.
Chapter 9, ―Appendix‖provides the glossary, reference information about the IP
phones comply with RFC 3261, SIP call flows and the sample configuration file.
The following sections are new for this version:
BLF Call Park on page 44
Web Server Type on page 46
Tones on page 52
Action URL on page 60
Action URI on page 63
Resource Files on page 83
Appendix B: Configuration Parameters on page 101
Appendix E: Sample Configuration File on page 227
Major updates have occurred to the following sections:
Creating Dial Plan on page 21
Phone Lock on page 27
Time and Date on page 28
Busy Lamp Field on page 57
Shared Call Appearance on page 58

About This Guide
vii
Major updates have occurred to the following sections:
Creating Dial Plan on page 21
Do Not Disturb (DND) on page 35
Call Forward on page 38
802.1X Authentication on page 70

Table of Contents
1
About This Guide ...................................................................... v
Documentations...............................................................................................................................v
In This Guide ....................................................................................................................................v
Changes from Previous Versions...................................................................................................vi
Changes from Version 1.0.......................................................................................................vi
Changes from Version 2.0...................................................................................................... vii
Table of Contents ..................................................................... 1
Product Overview..................................................................... 1
VoIP Principle....................................................................................................................................1
SIP Components...............................................................................................................................2
SIP IP Phone Models........................................................................................................................3
Physical Features of the SIP-T2xP IP Phones ...........................................................................4
Key Features of the SIP-T2xP IP Phones...................................................................................8
Getting Started....................................................................... 11
Connecting the Phone...................................................................................................................11
Installing the SIP-T28P and SIP-T26P IP Phones......................................................................11
Installing the SIP-T22P and SIP-T20P IP Phones......................................................................13
Initialization Process Overview ....................................................................................................15
Verifying Startup ............................................................................................................................17
Configuration Interfaces ............................................................................................................... 17
Phone User Interface..............................................................................................................17
Web User Interface ................................................................................................................17
Configuration Files..................................................................................................................18
Reading Icons ................................................................................................................................19
Configuring Network Parameters Manually ...............................................................................20
Creating Dial Plan .........................................................................................................................21
Replace Rule ...........................................................................................................................22
Dial-now ..................................................................................................................................23
Area Code...............................................................................................................................23
Block Out ................................................................................................................................. 24
Configuring Basic Features .................................................... 25
User Password ...............................................................................................................................26

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Administrator Password ................................................................................................................26
Phone Lock .....................................................................................................................................27
Time and Date ...............................................................................................................................28
Language .......................................................................................................................................30
Loading Language Packs ...................................................................................................... 31
Specifying the Language to Use...........................................................................................31
Missed Call Log .............................................................................................................................32
Local Directory ...............................................................................................................................33
Call Waiting.................................................................................................................................... 34
Auto Redial.....................................................................................................................................35
Do Not Disturb (DND).................................................................................................................... 35
Call Hold.........................................................................................................................................37
Call Forward ..................................................................................................................................38
Call Transfer ...................................................................................................................................39
Centralized Conference................................................................................................................40
Transfer on Conference Hang Up ................................................................................................41
Directed Pickup Key ...................................................................................................................... 41
Group Pickup Key .......................................................................................................................... 42
Call Park Key .................................................................................................................................. 44
BLF Call Park...................................................................................................................................44
Hotline ............................................................................................................................................45
Web Server Type............................................................................................................................46
Caller ID Presentation ...................................................................................................................46
Callee ID Presentation ..................................................................................................................47
DTMF...............................................................................................................................................48
Suppressing the Display of DTMF Digits ..................................................................................... 49
Configuring Advanced Features............................................ 51
Distinctive Ring Tones ....................................................................................................................51
Tones ...............................................................................................................................................52
Remote Phonebook .......................................................................................................................54
LDAP................................................................................................................................................55
Busy Lamp Field.............................................................................................................................57
Shared Call Appearance .............................................................................................................58
As-Feature-Event ...........................................................................................................................59
Action URL ......................................................................................................................................60
Action URI....................................................................................................................................... 63
Server Redundancy.......................................................................................................................65
Network Address Translation .......................................................................................................67
SNMP ..............................................................................................................................................69
802.1X Authentication ...................................................................................................................70
TR-069 Device Management ........................................................................................................72
Security Features.................................................................... 75

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3
Transport Layer Security................................................................................................................ 75
Encrypting Configuration Files .....................................................................................................78
Changing the AES Keys on the IP Phone.............................................................................. 79
Upgrading the Firmware........................................................ 81
Resource Files......................................................................... 83
Replace Rule Template .................................................................................................................83
Dial-now Template.........................................................................................................................84
Local Contact File ..........................................................................................................................85
Remote XML Phonebook...............................................................................................................87
Specifying the Access URL of Resource Files ..............................................................................88
Troubleshooting...................................................................... 91
Troubleshooting Methods .............................................................................................................91
Viewing Log Files....................................................................................................................91
Capturing Packets ..................................................................................................................92
Enabling the Watch Dog Feature..........................................................................................93
Getting Information from Status Indicators..........................................................................93
Analyzing Configuration Files ...............................................................................................94
Troubleshooting Solutions .............................................................................................................94
Why is the phone LCD screen blank? ...................................................................................94
Why can’t the phone obtain the IP address?.......................................................................94
Why does the phone display ―No Service‖? .......................................................................95
Why can’t the phone upgrade successfully? .......................................................................95
Why doesn’t the phone display time and date correctly? .................................................95
Why do I get poor audio during a call? ...............................................................................95
Why doesn’t the phone apply the configuration? ...............................................................96
How to solve the IP conflict problem? .................................................................................. 96
How to upgrade the phone firmware in the recovery mode?...........................................96
How to reset your phone to factory configurations?...........................................................96
Appendix ................................................................................ 99
Appendix A: Glossary...................................................................................................................99
Appendix B: Configuration Parameters ....................................................................................101
Setting Parameters in Configuration Files.......................................................................... 101
Basic and Advanced Parameters.......................................................................................101
Security Feature Parameters ...............................................................................................159
Upgrading the Firmware .....................................................................................................161
Resource Files .......................................................................................................................163
Troubleshooting ....................................................................................................................165
Configuring DSS Key ............................................................................................................ 166

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Appendix C: SIP (Session Initiation Protocol)............................................................................ 177
RFC and Internet Draft Support ..........................................................................................178
SIP Request............................................................................................................................179
SIP Header ............................................................................................................................ 180
SIP Responses .......................................................................................................................181
SIP Session Description Protocol (SDP) Usage ..................................................................184
Appendix D: SIP Call Flows ........................................................................................................184
Successful Call Setup and Disconnect ...............................................................................185
Unsuccessful Call Setup—Called User is Busy ..................................................................188
Unsuccessful Call Setup—Called User Does Not Answer ................................................191
Successful Call Setup and Call Hold..................................................................................194
Successful Call Setup and Call Waiting .............................................................................197
Call Transfer without Consultation ......................................................................................202
Call Transfer with Consultation............................................................................................207
Always Call Forward............................................................................................................213
Busy Call Forward ................................................................................................................216
No Answer Call Forward .....................................................................................................219
Call Conference.................................................................................................................... 222
Appendix E: Sample Configuration File ....................................................................................227
Index ......................................................................................233

Product Overview
1
This chapter contains the following information about the Yealink SIP-T2xP 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 implement.
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 worldwide 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 end points. Like other VoIP protocols, SIP is designed to
address the 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 the attributes of an end-to-end call.

Administrator’s Guide for SIP-T2xP IP Phones
2
SIP provides the capabilities to:
Determine the location of the target end point -- SIP supports address resolution,
name mapping, and call redirection.
Determine the media capabilities of the target end point -- Via Session Description
Protocol (SDP), SIP determines the ―lowest level‖ of common services between the
end points. Conferences are established using only the media capabilities that can
be supported by all end points.
Determine the availability of the target end point -- A call cannot be completed
because the target end point is unavailable, SIP determines whether the called
party is already on the phone or did not answer in the allotted number of rings. It
then returns a message indicating why the target end point was unavailable.
Establish a session between the origin and target end point -- The call can be
completed, SIP establishes a session between the end points. SIP also supports
mid-call changes, such as the addition of another end point to the conference or
the changing of a media characteristic or codec.
Handle the transfer and termination of calls -- SIP supports the transfer of calls from
one end point to another. During a call transfer, SIP simply establishes a session
between the transferee and a new end point (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 the 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 this 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. Using this

Product Overview
3
method may be the preferred measure when not using an application layer firewall,
application layer firewalls like to know what applications are flowing though which
ports and it is possible using content types of other applications other than the one you
are trying to let through which has been denied.
User agent server (UAS)
UAS is the Server that hosts the application responsible for receiving the SIP requests
from a UAC, and on reception 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 end point 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 the SIP-T2xP IP phone family. The Yealink SIP-T2xP IP phones are
end points in the overall network topology, which are designed to interoperate with
other compatible equipments including application servers, media servers,
internet-working gateways, voice bridges, and other end points. The SIP-T2xP IP phones
are characterized by a large number of functions, which simplify business
communication with a high standard of security and can work seamlessly with a large
number of SIP PBXs that support SIP.
The SIP-T2xP IP phones provide a powerful and flexible IP communication solution for
Ethernet TCP/IP networks, delivering excellent voice quality. The high-resolution graphic
display supplies content in multiple languages for system status, call history and
directory access. The SIP-T2xP IP phones also support advanced functionalities,
including LDAP, Busy Lamp Field, Shared Call Appearance and Centralized Conference.
The following IP phone models are described:
SIP-T28P
SIP-T26P
SIP-T22P
SIP-T20P
The Yealink SIP-T2xP IP phones comply with the SIP standard (RFC 3261), and they can
only be used within a network that supports this type of phone.
For the Yealink SIP-T2xP IP phones to successfully operate as SIP endpoints in your
network, they must meet the following requirements:
A working IP network is established.
Routers are configured for VoIP.

Administrator’s Guide for SIP-T2xP IP Phones
4
VoIP gateways are configured for SIP.
The latest (or compatible) firmware of the SIP-T2xP IP phones is available.
A call server is active and configured to receive and send SIP messages.
This section lists the available physical features of the SIP-T2xP IP phones.
SIP-T28P
Physical Features:
-TI TITAN chipset and TI voice engine
-320x160 graphic LCD with 4-level grayscales
-6 VoIP accounts, Broadsoft/Avaya/Asterisk validated
-HD Voice: HD Codec, HD Handset, HD Speaker
-48 keys including 16 programmable keys
-1xRJ9 (4P4C) handset port
-1xRJ9 (4P4C) headset port
-2xRJ45 10/100M Ethernet ports
-1XRJ12 (6P6C) expansion module port
-19 LEDs: 1xpower, 6xline, 1xmessage, 1xheadset, 10xmemory
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)
-Multi-language display

Product Overview
5
SIP-T26P
Physical Features:
-TI TITAN chipset and TI voice engine
-132x64 graphic LCD
-3 VoIP accounts, Broadsoft/Avaya/Asterisk validated
-HD Voice: HD Codec, HD Handset, HD Speaker
-45 keys including 13 programmable keys
-1xRJ9 (4P4C) handset port
-1xRJ9 (4P4C) headset port
-2xRJ45 10/100M Ethernet ports
-1XRJ12 (6P6C) expansion module port
-16 LEDs: 1xpower, 3xline, 1xmessage, 1xheadset, 10xmemory
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)
-Multi-language display

Administrator’s Guide for SIP-T2xP IP Phones
6
SIP-T22P
Physical Features:
-TI TITAN chipset and TI voice engine
-132x64 graphic LCD
-3 VoIP accounts, Broadsoft/Avaya/Asterisk validated
-HD Voice: HD Codec, HD Handset, HD Speaker
-32 keys including 4 programmable keys
-1xRJ9 (4P4C) handset port
-1xRJ9 (4P4C) headset port
-2xRJ45 10/100M Ethernet ports
-5 LEDs: 1xpower, 3xline, 1xmessage
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)
-Wall-mounted
-Multi-language display

Product Overview
7
SIP-T20P
Physical Features:
-TI TITAN chipset and TI voice engine
-3-line LCD with an icon line and 2x15 characters lines
-2 VoIP accounts, Broadsoft/Avaya/Asterisk validated
-HD Voice: HD Codec, HD Handset, HD Speaker
-31 keys including 9 programmable keys
-1xRJ9 (4P4C) handset port
-1xRJ9 (4P4C) headset port
-2xRJ45 10/100M Ethernet ports
-4 LEDs: 1xpower, 2xline, 1xmessage
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)
-Wall-mounted
-Multi-language display

Administrator’s Guide for SIP-T2xP IP Phones
8
In addition to the physical features introduced above, the SIP-T2xP IP phones also
support the following key features when running the latest firmware:
Phone Features
-Call Options: emergency call, call waiting, dial plan, call hold, call mute,
3-way conference, speed dial.
-Basic Features: DND, phone lock, auto redial, call transfer, hotline, call pickup,
call forward, calling party identity.
-Advanced Features: BLF/BLF list, shared call appearance, distinctive ring
tones, remote phonebook, SNMP, LDAP, 802.1x.
Codecs and Voice Features
-Wideband codec: G.722
-Narrowband codec: G.711, G.723.1, G.726, G.729AB
-VAD, CNG, AEC, PLC, AJB, AGC
-Full-duplex speakerphone with AEC
Network Features
-SIP v1 (RFC2543), v2 (RFC3261)
-NAT Traversal: STUN mode
-DTMF: INBAND, RFC2833, SIP INFO
-Proxy mode and peer-to-peer SIP link mode
-IP assignment: Static/DHCP/PPPoE
-Bridge/Router mode
-TFTP/DHCP/PPPoE client
-HTTP/HTTPS server
-DNS client
-NAT/DHCP server
Management
-FTP/TFTP/HTTP/PnP auto-provision
-Configuration: browser/phone/auto-provision
-Direct IP call without SIP proxy
-Dial number via SIP server
-Dial URL via SIP server
-TR-069