Yealink SIP-T21 User manual

T21P & T21
User Guide

Copyright © 2013 YEALINK NETWORK TECHNOLOGY CO., LTD
Copyright © 2013 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
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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.
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 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 SIP-T21P/SIP-T21 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 online:
http://www.yealink.com/GPLOpenSource.aspx?BaseInfoCateId=293&NewsCateId=293&CateId=293.

About This Guide
v
Thank you for choosing the SIP-T21P/SIP-T21 IP phone, exquisitely designed to provide
business telephony features, such as Call Hold, Call Transfer, Busy Lamp Field, Multicast
Paging and Conference over an IP network. The difference between the SIP-T21P and
SIP-T21 IP phone is that the former supports PoE, while the latter does not.
This guide provides everything you need to quickly use your new phone. First, verify
with your system administrator that the IP network is ready for phone configuration. Also
be sure to read the Packaging Contents and Regulatory Notices sections in this guide
before you set up and use the SIP-T21P/SIP-T21 IP phone.
If this is your first time using the SIP-T21P/SIP-T21 IP phone, we recommend that you first
refer to the Quick Installation Guide and Quick Reference Guide , available online:
http://www.yealink.com/SupportDownloadfiles_detail.aspx?CateId=333&flag=142.
Note
Topics provided in this guide include:
Chapter 1 Overview
Chapter 2 Getting Started
Chapter 3 Customizing Your Phone
Chapter 4 Basic Call Features
Chapter 5 Advanced Phone Features
This section describes the changes to this guide for each release and guide version.
Major updates have occurred to the following sections:
LED Instructions on page 4
Shared Line, Busy Lamp Field List, Network Directory and Network Call Log features are
hidden for IP phones in neutral firmware version, which are designed for BroadWorks
environment. Please contact your system administrator for more information.

User Guide for the SIP-T21P/SIP-T21 IP Phone
vi
Anonymous Call on page 93
Documentations of the SIP-T21 IP phone have also been added.
Major updates have occurred to the following sections:
LED Instructions on page 4
Anonymous Call on page 93
Troubleshooting on page 117

Table of Contents
vii
About This Guide ...................................................................... v
In This Guide ......................................................................................................................... v
Summary of Changes.......................................................................................................... v
Changes for Release 72, Guide Version 72.1 ................................................................ v
Changes for Release 71, Guide Version 71.91 ............................................................. vi
Changes for Release 71, Guide Version 71.90 ............................................................. vi
Table of Contents.....................................................................vii
Overview .................................................................................. 1
Hardware Component Instructions.................................................................................... 1
Icon Instructions.................................................................................................................... 3
LED Instructions..................................................................................................................... 4
User Interfaces ..................................................................................................................... 5
Phone User Interface........................................................................................................ 5
Web User Interface........................................................................................................... 5
Documentations ................................................................................................................... 8
Getting Started......................................................................... 9
Packaging Contents............................................................................................................. 9
Phone Installation............................................................................................................... 11
Phone Initialization ............................................................................................................. 13
Phone Status ....................................................................................................................... 13
Basic Network Settings...................................................................................................... 14
Registration ......................................................................................................................... 16
Idle Screen.......................................................................................................................... 16
Customizing Your Phone ......................................................... 17
General Settings ................................................................................................................ 17
Contrast............................................................................................................................ 17
Language......................................................................................................................... 18
Time & Date ..................................................................................................................... 19
Administrator Password ................................................................................................. 20
Key as Send..................................................................................................................... 21
Keypad Lock.................................................................................................................... 21
Audio Settings .................................................................................................................... 24

User Guide for the SIP-T21P/SIP-T21 IP Phone
viii
Volume ............................................................................................................................. 24
Ring Tones ........................................................................................................................ 25
Contact Management....................................................................................................... 27
Directory........................................................................................................................... 27
Local Directory ................................................................................................................ 28
Blacklist ............................................................................................................................ 38
Remote Phone Book........................................................................................................ 40
Call History Management ................................................................................................ 42
System Customizations...................................................................................................... 44
Logo Customization ........................................................................................................ 44
Headset Use.................................................................................................................... 45
DSS Keys .......................................................................................................................... 46
Account Management ................................................................................................... 54
Dial Plan ........................................................................................................................... 55
Emergency Number........................................................................................................ 60
Live Dialpad .................................................................................................................... 61
Hotline .............................................................................................................................. 62
Basic Call Features................................................................. 63
Placing Calls ....................................................................................................................... 63
Answering Calls ................................................................................................................. 65
Ending Calls........................................................................................................................ 66
Redialing Numbers ............................................................................................................ 67
Recent Call In Dialing ........................................................................................................ 67
Auto Answer ....................................................................................................................... 68
Auto Redial.......................................................................................................................... 69
Call Completion ................................................................................................................. 70
Call Return........................................................................................................................... 71
Call Mute............................................................................................................................. 71
Call Hold/Resume............................................................................................................... 72
Do Not Disturb (DND) ........................................................................................................ 73
Call Forward ....................................................................................................................... 76
Call Transfer ........................................................................................................................ 82
Call Waiting ........................................................................................................................ 84
Conference ......................................................................................................................... 84
Local Conference............................................................................................................ 85
Network Conference ...................................................................................................... 85
Call Park .............................................................................................................................. 87
Call Pickup .......................................................................................................................... 88
Anonymous Call ................................................................................................................. 93
Anonymous Call Rejection ................................................................................................ 94
Advanced Phone Features..................................................... 95

Table of Contents
ix
Busy Lamp Field (BLF) ....................................................................................................... 95
Call Recording .................................................................................................................... 97
Hot Desking ........................................................................................................................ 99
Intercom ............................................................................................................................ 101
Outgoing Intercom Calls.............................................................................................. 101
Incoming Intercom Calls .............................................................................................. 101
Multicast Paging............................................................................................................... 103
Sending RTP Stream ..................................................................................................... 103
Receiving RTP Stream................................................................................................... 105
Music on Hold................................................................................................................... 106
Automatic Call Distribution (ACD).................................................................................. 107
Messages.......................................................................................................................... 109
Short Message Service (SMS) .................................................................................... 109
Voice Mail ...................................................................................................................... 111
Message Waiting Indicator (MWI) ............................................................................. 112
Troubleshooting .....................................................................117
Regulatory Notices ................................................................127
Service Agreements ........................................................................................................ 127
Limitations of Liability ...................................................................................................... 127
Safety Instructions ............................................................................................................ 127
Appendix A - Time Zones......................................................129
Index ......................................................................................131

User Guide for the SIP-T21P/SIP-T21 IP Phone
x

Overview
1
This chapter provides the overview of the SIP-T21P/SIP-T21 IP phone. Topics include:
Hardware Component Instructions
Icon Instructions
LED Instructions
User Interfaces
Documentations
If you require additional information or assistance with your new phone, contact your
system administrator.
The main hardware components of the SIP-T21P/SIP-T21 IP phone are the LCD screen and
the keypad.

User Guide for the SIP-T21P/SIP-T21 IP Phone
2
Hardware component instructions of the SIP-T21P/SIP-T21 IP phone are:
Item
Description
①
LCD Screen
Shows information about calls, messages, soft keys,
time, date and other relevant data:
• Call information —caller ID, call duration
• Icons (for example, )
• Missed call text or second incoming caller information
• Prompt text (for example, "Saving config file!")
• Time and date
②
Power Indicator LED
Indicates phone power status and phone status.
③
Line Keys
Use these keys to activate up to two accounts and assign
various features.
④
MESSAGE Key
Indicates and accesses voice mails.
⑤
HEADSET Key
Toggles the headset mode.
⑥
TRAN Key
Transfers a call to another party.
⑦
RD Key
Redials a previously dialed number.
⑧
Speakerphone Key
Toggles the hands-free speakerphone mode.
⑨
Volume Key
Adjusts the volume of the handset, headset, speaker,
and ringer.
⑩
Keypad
Provides the digits, letters and special characters in
context-sensitive applications.
⑪
Scroll through the displayed information.
Confirms actions or answers incoming calls.
Cancels actions, rejects incoming calls, mutes or
un-mutes calls.
⑫
Soft Keys
Label automatically to identity their context-sensitive
features.

Overview
3
Icons appearing on the LCD screen are described in the following table:
Icon
Description
Network is unavailable
Registered successfully
Register failed
Registering
Hands-free speakerphone mode
Handset mode
Headset mode
Multi-lingual lowercase letters input mode
Multi-lingual uppercase letters input mode
Alphanumeric input mode
Numeric input mode
Multi-lingual uppercase and lowercase
letters input mode
Voice Mail
Text Message
Auto Answer
Do Not Disturb
Call Forwarded/Forwarded Calls
Call Hold
Call Mute
Ringer volume is 0

User Guide for the SIP-T21P/SIP-T21 IP Phone
4
Icon
Description
Keypad Lock
Received Calls
Placed Calls
Missed Calls
Recording box is full
A call cannot be recorded
Recording starts successfully
Recording cannot be started
Recording cannot be stopped
Power Indicator LED
LED Status
Description
Solid green
The phone is initializing.
The phone is busy.
The phone is idle.
The call is placed on hold or is held.
The phone receives a text message or voice mail.
Fast flashing green (300ms)
The phone is ringing.
The call is mute.
Off
The phone is powered off.
Line key LED
LED Status
Description
Solid green
The line is in conversation.
The line is seized.
Fast flashing green
The line receives an incoming call.
Slow flashing green
The call is placed on hold.
Off
The line is inactive.

Overview
5
Line key LED (configured as a BLF key)
LED Status
Description
Solid green
The monitored user is idle.
Fast flashing green (200ms)
The monitored user receives an incoming call.
Slow flashing green (500ms)
The monitored user is dialing.
The monitored user is talking.
The monitored user’s conversation is placed on
hold.
Slow flashing green (1s)
The call is parked against the monitored user’s
phone number.
Off
The monitored user does not exist.
Note
Two ways to customize configurations of your SIP-T21P/SIP-T21 IP phone:
The user interface on the IP phone.
The user interface in a web browser on your PC.
The hardware components keypad and LCD screen constitute the phone user interface,
which allows the user to execute all call operation tasks and basic configuration
changes directly on the phone. In addition, you can use the web user interface to
access all configuration settings. In many cases, either the phone user interface and/or
the web user interface interchangeably. However, in some cases, it is only possible to
use one or the other interface to operate the phone and change settings.
You can customize your phone by pressing the Menu soft key to access the phone user
interface. The Advanced Settings option is only accessible to the administrator, and the
default administrator password is “admin”(case-sensitive). For more information on
customizing your phone with the available options from the phone user interface, refer
to Customizing Your Phone on page 17.
In addition to the phone user interface, you can also customize your phone via web user
interface. In order to access the web user interface, you need to know the IP address of
your new phone. To obtain the IP address, press the OK key on the phone. Enter the IP
The above introduces the default LED status. The statuses of the power indicator LED and
BLF key are configurable via web user interface. For more information, refer to
Yealink_SIP-T2xP_and_SIP-T19P_IP_Phone_Family_Administrator_Guide .

User Guide for the SIP-T21P/SIP-T21 IP Phone
6
address (e.g., http://192.168.0.10 or 192.168.0.10) in the address bar of web browser on
your PC. The default administrator user name and password are both “admin”
(case-sensitive).
The options you can use to customize the IP phone via phone user interface and/or via
web user interface are listed in the following table:
Options
Phone User Interface
Web User Interface
Status
√
√
--IP Address
--MAC
--Firmware
--Network
--Phone
--Accounts
Basic Phone Settings
--Contrast
√
√
--Language
√
√
--Time & Date
√
√
--Administrator Password
√
√
--Key as Send
√
√
--Keypad Lock
√
√
-- Volume
√
--Ring Tones
√
√
--Contact Management
--Directory
√
--Local Directory
√
√
--Blacklist
√
√
--Remote Phone Book
√
--Call History Management
√
√
--Logo Customization
√
--Headset Prior
√
--DSS Keys
√
√
--Account Registration
√
√
--Dial Plan
√
--Emergency Number
√
--Live Dialpad
√
--Hotline
√
√
Basic Call Features
√
--Recent Call In Dialing
--Auto Answer
√
--Auto Redial
√
--Call Completion
√
--Call Return
√

Overview
7
Options
Phone User Interface
Web User Interface
--DND
√
--Call Forward
√
--Call Transfer
√
--Call Waiting
√
--Conference
--Call Park
√
--Call Pickup
√
--Anonymous Call
√
--Anonymous Call Rejection
√
Advanced Phone Features
√
--BLF
√
--Call Recording
√
--Hot Desking
√
--Intercom
√
--Multicast Paging
--Music on Hold
--ACD
√
--Messages
√
SIP Account
√
--User Options
--Register Status
√
--Activation
√
--Label
√
--Display Name
√
--Register Name
√
--User Name
√
--Password
√
--SIP Server1/2
√
--Server Option
--Server Port
--Outbound Status
√
--Outbound Proxy
√
--NAT Traversal
--STUN Status
√
--STUN Server
√
Note
The table above lists most of the feature options. Please refer to the relevant sections for
more information.

User Guide for the SIP-T21P/SIP-T21 IP Phone
8
The following table shows documentations available for the SIP-T21P/SIP-T21 IP phone.
Name
Contents
Where found
Language
Quick Installation
Guide
Basic setup of the
phone
In the
package
English
Quick Reference
Guide
Basic call features and
phone customizations
In the
package
English
User Guide
Phone/Web user
interface settings
Basic call features and
advanced phone
features
CD attached
in the
package
English
Note
You can also download the latest documentations online:
http://www.yealink.com/SupportDownloadfiles_detail.aspx?CateId=333&flag=142.

Getting Started
9
This chapter provides basic installation instructions and information for obtaining the
best performance with the SIP-T21P/SIP-T21 IP phone. Topics include:
Packaging Contents
Phone Installation
Phone Initialization
Phone Status
Basic Network Settings
Registration
Idle Screen
If you require additional information or assistance with your new phone, contact your
system administrator.
The following components are included in your SIP-T21P/SIP-T21 IP phone package:
SIP-T21P/SIP-T21 IP Phone
Phone Stand