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

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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
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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

About This Guide
xi
LDAP on page 491
Action URL on page 600
Action URI on page 619
Server Redundancy on page 629
The following sections are new for this version:
Expansion Module on page 15
Obtaining Configuration Files and Resource Files on page 52
DHCP Option on page 73
Bluetooth on page 128
Enable Page Tips on page 139
Label Length on page 141
Account Registration on page 142
Display Method on Dialing on page 160
Redial Tone on page 282
Ringer Device for Headset on page 284
IP Direct Auto Answer on page 295
Allow IP Call on page 296
Accept SIP Trust Server Only on page 298
Transfer Mode via Dsskey on page 379
Allow Trans Exist Call on page 380
Call Number Filter on page 416
Call Timeout on page 454
Send user=phone on page 454
SIP Send MAC on page 457
SIP Send Line on page 460
Reserve # in User Name on page 462
Password Dial on page 464
Unregister When Reboot on page 466
100 Reliable Retransmission on page 468
Reboot in Talking on page 470
Logon Wizard on page 596
Auto-Logout Time on page 809

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
xii
Appendix E: Auto Provisioning Flowchart (Keep user personalized configuration
settings) on page 928
Major updates have occurred to the following sections:
DHCP on page 68
Time and Date on page 165
Language on page 182
Input Method on page 193
Logo Customization on page 206
Softkey Layout on page 210
Dial Plan on page 226
Directory on page 248
Search Source in Dialing on page 251
Local Directory on page 259
SIP Session Timer on page 335
Call Hold on page 341
DTMF on page 431
Remote Phone Book on page 484
VLAN on page 655
Network Address Translation on page 704
Comfort Noise Generation on page 785
Phone Lock on page 810
Troubleshooting Methods on page 853
Troubleshooting Solutions on page 884
This version is updated to incorporate SIP-T48G IP phones. Documentations of the newly
released SIP-T27P and SIP-T21(P) E2 IP phones have also been added.
Major updates have occurred to the following sections:
Reading Icons on page 38
Configuration Files on page 48
Power Indicator LED on page 103
Backlight on page 115
Time and Date on page 164
Auto Answer on page 288

About This Guide
xiii
Return Code When Refuse on page 330
DTMF on page 431
Phone Lock on page 810
Appendix B: Time Zones on page 907
This version is updated to incorporate SIP-T46G, SIP-T42G, SIP-T41P and SIP-T29G IP
phones. The following sections are new for this version:
Wallpaper on page 112
Hide Features Access Code on page 529
Major updates have occurred to the following sections:
DHCP on page 68
Call Display on page 153
Input Method on page 193
BLF List on page 519
IPv6 Support on page 725
Viewing Log Files on page 853

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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Table of Contents
xv
About This Guide ...................................................................... v
Documentations...............................................................................................................................v
Conventions Used in Yealink Documentations .............................................................................v
In This Guide ...................................................................................................................................vi
Summary of Changes ................................................................................................................... vii
Changes for Release 80, Guide Version 80.96..................................................................... vii
Changes for Release 80, Guide Version 80.95..................................................................... vii
Changes for Release 80, Guide Version 80.91..................................................................... vii
Changes for Release 80, Guide Version 80.90.................................................................... viii
Changes for Release 80, Guide Version 80.82.................................................................... viii
Changes for Release 80, Guide Version 80.81.................................................................... viii
Changes for Release 80, Guide Version 80.80...................................................................... ix
Changes for Release 80, Guide Version 80.60.......................................................................x
Changes for Release 80, Guide Version 80.21...................................................................... xi
Changes for Release 80, Guide Version 80.20..................................................................... xii
Changes for Release 80, Guide Version 80.6...................................................................... xiii
Table of Contents ................................................................... xv
Product Overview..................................................................... 1
VoIP Principle....................................................................................................................................1
SIP Components...............................................................................................................................2
SIP IP Phone Models........................................................................................................................3
Physical Features of IP Phones ................................................................................................4
Key Features of IP Phones...................................................................................................... 15
Expansion Module.........................................................................................................................17
Getting Started....................................................................... 19
Connecting the IP Phones .............................................................................................................19
Attaching the Stand and the Optional Wall Mount Bracket (not Applicable to CP860 IP
Phones)....................................................................................................................................20
Inserting the Camera (Only Applicable to SIP VP-T49G IP Phones)...................................27
Connecting the Handset and Optional Headset (not Applicable to CP860 IP Phones) .28
Connecting the Power and Network ....................................................................................30
Connecting the Optional Extension Microphones (Only Applicable to CP860 IP Phones)
..................................................................................................................................................33

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Connecting the Optional USB Flash Drive (Only Applicable to SIP
VP-T49G/SIP-T27G/CP860 IP Phones) ......................................................................................33
Connecting the Optional PC or Mobile Device (Only Applicable to CP860 IP Phones)..35
Connecting the Optional External Monitor (Only Applicable to SIP VP-T49G IP Phones)35
Initialization Process Overview ....................................................................................................36
Verifying Startup ............................................................................................................................38
Reading Icons ................................................................................................................................39
Configuration Methods.................................................................................................................48
Phone User Interface..............................................................................................................48
Web User Interface ................................................................................................................48
Configuration Files..................................................................................................................48
Obtaining Configuration Files and Resource Files .....................................................................52
Keep User Personalized Settings .................................................................................................55
Configuration Parameters......................................................................................................55
Scenario A Keep user personalized configuration settings ...............................................57
Scenario B Clear user personalized configuration settings ...............................................61
Scenario C Keep user personalized settings after factory reset .......................................62
Scenario D Import or export the local configuration file ....................................................64
Provisioning Server........................................................................................................................66
Supported Provisioning Protocols .........................................................................................66
Setting up the Provisioning Server........................................................................................66
Deploying Phones from the Provisioning Server ................................................................. 67
Configuring Basic Network Parameters ......................................................................................68
DHCP .......................................................................................................................................68
DHCP Option...........................................................................................................................73
Configuring Network Parameters Manually ........................................................................79
PPPoE .......................................................................................................................................84
Configuring Transmission Methods of the Internet Port and PC Port .................................87
Configuring PC Port Mode.....................................................................................................91
Upgrading Firmware.....................................................................................................................93
Upgrading Firmware via Web User Interface .....................................................................94
Upgrading Firmware from the Provisioning Server ............................................................94
Configuring Basic Features ...................................................101
Power Indicator LED ....................................................................................................................103
Notification Popups......................................................................................................................108
Contrast ........................................................................................................................................111
Wallpaper.....................................................................................................................................113
Screen Saver................................................................................................................................117
Backlight.......................................................................................................................................123
Bluetooth ......................................................................................................................................128
Wi-Fi ..............................................................................................................................................131
Enable Page Tips ......................................................................................................................... 139
Label Length.................................................................................................................................141

Table of Contents
xvii
Account Registration ...................................................................................................................142
Call Display ..................................................................................................................................155
Display Method on Dialing.........................................................................................................160
Web Server Type..........................................................................................................................161
Time and Date .............................................................................................................................165
NTP Time Server ...................................................................................................................166
Time and Date Settings .......................................................................................................171
Daylight Saving Time ........................................................................................................... 175
Language .....................................................................................................................................182
Loading Language Packs ....................................................................................................183
Specifying the Language to Use.........................................................................................190
Input Method ...............................................................................................................................193
Keypad Input Method Customization ................................................................................193
Onscreen Keyboard Input Method Customization ...........................................................197
Specifying the Default Input Method .................................................................................205
Logo Customization .....................................................................................................................206
Customizing a Logo Template File......................................................................................207
Configuring the Logo Shown on the Idle Screen...............................................................208
Softkey Layout..............................................................................................................................210
Customizing Softkey Layout Template File.........................................................................212
Key As Send .................................................................................................................................222
Dial Plan........................................................................................................................................226
Replace Rule .........................................................................................................................227
Dial-now ................................................................................................................................232
Area Code.............................................................................................................................238
Block Out...............................................................................................................................241
Hotline ..........................................................................................................................................243
Off Hook Hot Line Dialing...........................................................................................................246
Directory.......................................................................................................................................248
Customizing a Directory Template File...............................................................................248
Search Source in Dialing.............................................................................................................251
Customizing a Super Search Template File .......................................................................251
Save Call Log............................................................................................................................... 254
Call List Show Number ................................................................................................................256
Missed Call Log ...........................................................................................................................257
Local Directory............................................................................................................................. 259
Customizing a Local Contact File........................................................................................259
Live Dialpad................................................................................................................................. 276
Call Waiting..................................................................................................................................278
Redial Tone...................................................................................................................................282
Ringer Device for Headset .........................................................................................................284
Auto Redial...................................................................................................................................286
Auto Answer.................................................................................................................................288
IP Direct Auto Answer..................................................................................................................295

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Allow IP Call .................................................................................................................................296
Accept SIP Trust Server Only ......................................................................................................298
Call Completion...........................................................................................................................299
Anonymous Call...........................................................................................................................303
Anonymous Call Rejection ..........................................................................................................308
Do Not Disturb (DND)..................................................................................................................312
Busy Tone Delay...........................................................................................................................328
Return Code When Refuse ..........................................................................................................330
Early Media..................................................................................................................................331
180 Ring Workaround ..................................................................................................................332
Use Outbound Proxy in Dialog...................................................................................................333
SIP Session Timer .........................................................................................................................335
Session Timer ...............................................................................................................................338
Call Hold.......................................................................................................................................341
Music on Hold....................................................................................................................... 345
Call Forward ................................................................................................................................348
Call Transfer .................................................................................................................................370
Network Conference ...................................................................................................................373
Feature Key Synchronization......................................................................................................375
Transfer on Conference Hang Up ..............................................................................................377
Transfer Mode via Dsskey...........................................................................................................379
Allow Trans Exist Call...................................................................................................................380
Directed Call Pickup....................................................................................................................382
Group Call Pickup........................................................................................................................394
Dialog Info Call Pickup................................................................................................................405
Recent Call In Dialing..................................................................................................................408
ReCall............................................................................................................................................410
Call Number Filter........................................................................................................................416
Call Park .......................................................................................................................................418
Calling Line Identification Presentation.....................................................................................423
Connected Line Identification Presentation ..............................................................................428
DTMF.............................................................................................................................................431
Methods of Transmitting DTMF Digit ..................................................................................431
Suppress DTMF Display.......................................................................................................437
Transfer via DTMF.................................................................................................................439
Play Local DTMF Tone ..........................................................................................................441
Allow Mute ...................................................................................................................................443
Intercom........................................................................................................................................444
Outgoing Intercom Calls......................................................................................................445
Incoming Intercom Calls ......................................................................................................450
Call Timeout .................................................................................................................................454
Ringing Timeout ...........................................................................................................................454
Send user=phone .......................................................................................................................455
SIP Send MAC..............................................................................................................................457

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SIP Send Line................................................................................................................................460
Reserve # in User Name.............................................................................................................462
Password Dial...............................................................................................................................464
Unregister When Reboot.............................................................................................................466
100 Reliable Retransmission .......................................................................................................468
Reboot in Talking..........................................................................................................................470
Answer By Hand..........................................................................................................................472
Bandwidth ....................................................................................................................................473
Screenshot and Recording .........................................................................................................476
Screenshot ............................................................................................................................476
Call and Conference Recording (for SIP VP-T49G IP Phones)...........................................477
Call and Conference Recording (for CP860 IP Phones) ....................................................479
External Monitor ..........................................................................................................................479
Configuring Advanced Features...........................................483
Remote Phone Book ....................................................................................................................484
Customizing Remote Phone Book Template File................................................................484
LDAP..............................................................................................................................................491
Busy Lamp Field (BLF) .................................................................................................................506
BLF List .......................................................................................................................................... 521
Hide Features Access Code.......................................................................................................529
Automatic Call Distribution (ACD) .............................................................................................531
Shared Call Appearance (SCA) ................................................................................................538
Bridge Lines Appearance (BLA) ................................................................................................551
Message Waiting Indicator ........................................................................................................554
Short Message Service (SMS) ...................................................................................................560
Multicast Paging ..........................................................................................................................561
Sending RTP Stream.............................................................................................................561
Receiving RTP Stream ..........................................................................................................575
Call Recording .............................................................................................................................580
Hot Desking..................................................................................................................................588
Logon Wizard ...............................................................................................................................596
Action URL ....................................................................................................................................600
Action URI.....................................................................................................................................619
Configuring Trusted IP Address for Action URI...................................................................624
Scenario A - Capturing the Current Screen of the Phone.................................................627
Scenario B - Placing a Call via Web User Interface..........................................................628
Server Redundancy.....................................................................................................................629
Server Domain Name Resolution........................................................................................ 643
Static DNS Cache ........................................................................................................................647
VLAN .............................................................................................................................................655
LLDP .......................................................................................................................................656
CDP ........................................................................................................................................659
Manual Configuration for VLAN in the Wired Network.....................................................662

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DHCP VLAN ...........................................................................................................................666
Configuring VLAN Feature in the Wireless Network..........................................................669
VPN................................................................................................................................................671
Voice Quality Monitoring ............................................................................................................674
RTCP-XR..................................................................................................................................675
VQ-RTCPXR............................................................................................................................677
Quality of Service ........................................................................................................................ 695
Configuring the IP phone for Use with a Firewall or NAT.........................................................701
Reserved Ports ...................................................................................................................... 701
Network Address Translation ..............................................................................................704
Real-Time Transport Protocol.......................................................................................................717
TR-069 Device Management ......................................................................................................719
IPv6 Support ................................................................................................................................. 725
Configuring Audio Features ..................................................737
Ring Tones ....................................................................................................................................737
Distinctive Ring Tones ..................................................................................................................742
Tones .............................................................................................................................................750
Voice Mail Tone............................................................................................................................758
Headset Prior ...............................................................................................................................759
Dual Headset............................................................................................................................... 761
Sending Volume...........................................................................................................................763
Audio Codecs ..............................................................................................................................766
Acoustic Clarity Technology........................................................................................................781
Acoustic Echo Cancellation ................................................................................................. 781
Background Noise Suppression..........................................................................................783
Automatic Gain Control .......................................................................................................783
Voice Activity Detection .......................................................................................................783
Comfort Noise Generation ..................................................................................................785
Jitter Buffer ............................................................................................................................787
Configuring Video Features ..................................................791
Video Settings..............................................................................................................................791
Video Codecs...............................................................................................................................800
Configuring Security Features...............................................805
User Password .............................................................................................................................805
Administrator Password ..............................................................................................................807
Auto-Logout Time.........................................................................................................................809
Phone Lock ...................................................................................................................................810
Transport Layer Security..............................................................................................................822
Secure Real-Time Transport Protocol..........................................................................................833