Yealink Yealink SIP-T48G Service manual

Copyright © 2015 YEALINK NETWORK TECHNOLOGY
Copyright © 2015 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
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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
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CO., LTD. shall not be liable for errors contained herein nor for incidental or consequential
damages in connection with the furnishing, performance, or use of this guide.
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.
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-T48G, SIP-T46G, SIP-T42G, SIP-T41P, SIP-T40P, SIP-T29G, SIP-T27P,
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 659), 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 Security Features” describes how to configure the security
features on IP phones.
Chapter 7, “Troubleshooting” describes how to troubleshoot IP phones and
provides some common troubleshooting solutions.
Chapter 8, “Appendix” provides the glossary, reference information about IP
phones compliant with RFC 3261, SIP call flows and the sample configuration files.

About This Guide
vii
This section describes the changes to this guide for each release and guide version.
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 117
Major updates have occurred to the following sections:
Expansion Module on page 16
Power Indicator LED on page 97
Contrast on page 104
Backlight on page 109
Bluetooth on page 114
Auto Answer on page 251
Session Timer on page 296
Dialog Info Call Pickup on page 359
Methods of Transmitting DTMF Digit on page 383
Busy Lamp Field (BLF) on page 445
Multicast Paging on page 497
Action URI on page 554
VPN on page 602
Quality of Service on page 625
NAT Traversal on page 630
IPv6 Support on page 647
Distinctive Ring Tones on page 664
Viewing Log Files on page 749
Troubleshooting Solutions on page 772
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file on
page 822

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
viii
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 406
Shared Call Appearance (SCA) on page 475
Bridge Lines Appearance (BLA) on page 487
Short Message Service (SMS) on page 496
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file on
page 822
Major updates have occurred to the following sections:
Documentations on page v
Expansion Module on page 14
Reading Icons on page 35
Configuration Files on page 44
Obtaining Configuration Files and Resource Files on page 48
Account Registration on page 126
Auto Answer on page 251
IP Direct Auto Answer on page 257
Do Not Disturb (DND) on page 273
Return Code When Refuse on page 288
Call Forward on page 305
LDAP on page 431
Action URL on page 534
Action URI on page 554
Server Redundancy on page 564
The following sections are new for this version:
Expansion Module on page 14
Obtaining Configuration Files and Resource Files on page 48
DHCP Option on page 68
Bluetooth on page 114
Enable Page Tips on page 122

About This Guide
ix
Label Length on page 124
Account Registration on page 126
Display Method on Dialing on page 141
Redial Tone on page 245
Ringer Device for Headset on page 247
IP Direct Auto Answer on page 257
Allow IP Call on page 258
Accept SIP Trust Server Only on page 260
Transfer Mode via Dsskey on page 335
Allow Trans Exist Call on page 336
Call Number Filter on page 369
Call Timeout on page 405
Send user=phone on page 406
SIP Send MAC on page 409
SIP Send Line on page 411
Reserve # in User Name on page 413
Password Dial on page 415
Unregister When Reboot on page 417
100 Reliable Retransmission on page 419
Reboot in Talking on page 421
Logon Wizard on page 531
Auto-Logout Time on page 706
Appendix E: Auto Provisioning Flowchart (Keep user personalized configuration
settings) on page 821
Major updates have occurred to the following sections:
DHCP on page 64
Time and Date on page 146
Language on page 163
Input Method on page 173
Logo Customization on page 178
Softkey Layouton page 182
Dial Plan on page 195
Directory on page 215
Search Source in Dialing on page 217

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
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Local Directory on page 225
SIP Session Timer on page 294
Call Hold on page 299
DTMF on page 383
Remote Phone Book on page 424
VLAN on page 590
Network Address Translation on page 629
Comfort Noise Generation on page 698
Phone Lock on page 708
Troubleshooting Methods on page 749
Troubleshooting Solutions on page 772
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 33
Configuration Files on page 44
Power Indicator LED on page 97
Backlight on page 108
Time and Date on page 145
Auto Answer on page 250
Return Code When Refuse on page 288
DTMF on page 383
Phone Lock on page 708
Appendix B: Time Zones on page 793
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 105
Hide Features Access Code on page 466
Major updates have occurred to the following sections:

About This Guide
xi
DHCP on page 64
Call Display on page 135
Input Method on page 173
BLF List on page 457
IPv6 Support on page 647
Viewing Log Files on page 749

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
xii

Table of Contents
xiii
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 80.80..................................................................... vii
Changes for Release 80, Guide Version 80.60.................................................................... viii
Changes for Release 80, Guide Version 80.21.................................................................... viii
Changes for Release 80, Guide Version 80.20.......................................................................x
Changes for Release 80, Guide Version 80.6.........................................................................x
Table of Contents ...................................................................xiii
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......................................................................................................14
Expansion Module.........................................................................................................................16
Getting Started....................................................................... 19
Connecting the IP Phones .............................................................................................................19
Initialization Process Overview ....................................................................................................32
Verifying Startup ............................................................................................................................33
Reading Icons ................................................................................................................................35
Configuration Methods.................................................................................................................44
Phone User Interface..............................................................................................................44
Web User Interface ................................................................................................................44
Configuration Files..................................................................................................................44
Obtaining Configuration Files and Resource Files .....................................................................48
Keep User Personalized Settings .................................................................................................51
Configuration Parameters...................................................................................................... 51
Scenario A Keep user personalized configuration settings ...............................................53
Scenario B Clear user personalized configuration settings ...............................................57
Scenario C Keep user personalized settings after factory reset .......................................58

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xiv
Scenario D Import or export the local configuration file ....................................................60
Provisioning Server........................................................................................................................62
Supported Provisioning Protocols .........................................................................................62
Setting up the Provisioning Server........................................................................................62
Deploying Phones from the Provisioning Server ................................................................. 63
Configuring Basic Network Parameters ......................................................................................64
DHCP .......................................................................................................................................64
DHCP Option...........................................................................................................................68
Configuring Network Parameters Manually ........................................................................74
PPPoE .......................................................................................................................................79
Configuring Transmission Methods of the Internet Port and PC Port .................................82
Configuring PC Port Mode.....................................................................................................86
Upgrading Firmware.....................................................................................................................87
Upgrading Firmware via Web User Interface .....................................................................88
Upgrading Firmware from the Provisioning Server ............................................................89
Configuring Basic Features .................................................... 95
Power Indicator LED ......................................................................................................................97
Notification Popups......................................................................................................................102
Contrast ........................................................................................................................................104
Wallpaper.....................................................................................................................................106
Backlight.......................................................................................................................................109
Bluetooth ......................................................................................................................................114
Wi-Fi ..............................................................................................................................................117
Enable Page Tips .........................................................................................................................123
Label Length.................................................................................................................................124
Account Registration ...................................................................................................................126
Call Display ..................................................................................................................................138
Display Method on Dialing.........................................................................................................141
Web Server Type..........................................................................................................................143
Time and Date .............................................................................................................................146
NTP Time Server ...................................................................................................................147
Time and Date Settings .......................................................................................................152
Daylight Saving Time ...........................................................................................................156
Language .....................................................................................................................................163
Loading Language Packs ....................................................................................................164
Specifying the Language to Use.........................................................................................171
Input Method ...............................................................................................................................173
Input Method Customization...............................................................................................173
Specifying the Default Input Method .................................................................................177
Logo Customization.....................................................................................................................178
Customizing a Logo Template File ......................................................................................179
Configuring the Logo Shown on the Idle Screen...............................................................180
Softkey Layout..............................................................................................................................182

Table of Contents
xv
Customizing Softkey Layout Template File......................................................................... 184
Key As Send ................................................................................................................................. 191
Dial Plan........................................................................................................................................195
Replace Rule .........................................................................................................................196
Dial-now ................................................................................................................................200
Area Code.............................................................................................................................206
Block Out...............................................................................................................................208
Hotline ..........................................................................................................................................210
Off Hook Hot Line Dialing...........................................................................................................213
Directory.......................................................................................................................................215
Customizing a Directory Template File...............................................................................215
Search Source in Dialing.............................................................................................................217
Customizing a Super Search Template File .......................................................................218
Save Call Log...............................................................................................................................220
Call List Show Number ................................................................................................................222
Missed Call Log ...........................................................................................................................224
Local Directory.............................................................................................................................225
Customizing a Local Contact File........................................................................................226
Live Dialpad.................................................................................................................................240
Call Waiting..................................................................................................................................242
Redial Tone...................................................................................................................................245
Ringer Device for Headset .........................................................................................................247
Auto Redial...................................................................................................................................248
Auto Answer.................................................................................................................................251
IP Direct Auto Answer..................................................................................................................257
Allow IP Call .................................................................................................................................258
Accept SIP Trust Server Only ......................................................................................................260
Call Completion...........................................................................................................................261
Anonymous Call...........................................................................................................................264
Anonymous Call Rejection ..........................................................................................................269
Do Not Disturb (DND)..................................................................................................................273
Busy Tone Delay........................................................................................................................... 287
Return Code When Refuse ..........................................................................................................288
Early Media..................................................................................................................................290
180 Ring Workaround ..................................................................................................................290
Use Outbound Proxy in Dialog...................................................................................................292
SIP Session Timer .........................................................................................................................294
Session Timer ...............................................................................................................................296
Call Hold.......................................................................................................................................299
Music on Hold.......................................................................................................................302
Call Forward ................................................................................................................................305
Call Transfer .................................................................................................................................327
Network Conference ...................................................................................................................329
Feature Key Synchronization......................................................................................................331

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Transfer on Conference Hang Up ..............................................................................................333
Transfer Mode via Dsskey...........................................................................................................335
Allow Trans Exist Call...................................................................................................................336
Directed Call Pickup....................................................................................................................338
Group Call Pickup........................................................................................................................349
Dialog Info Call Pickup................................................................................................................359
Recent Call In Dialing ..................................................................................................................362
ReCall............................................................................................................................................363
Call Number Filter........................................................................................................................369
Call Park .......................................................................................................................................371
Calling Line Identification Presentation.....................................................................................376
Connected Line Identification Presentation ..............................................................................380
DTMF.............................................................................................................................................383
Methods of Transmitting DTMF Digit ..................................................................................383
Suppress DTMF Display.......................................................................................................389
Transfer via DTMF.................................................................................................................391
Play Local DTMF Tone ..........................................................................................................393
Allow Mute ...................................................................................................................................394
Intercom........................................................................................................................................396
Outgoing Intercom Calls......................................................................................................396
Incoming Intercom Calls ......................................................................................................401
Call Timeout .................................................................................................................................405
Ringing Timeout ...........................................................................................................................406
Send user=phone .......................................................................................................................406
SIP Send MAC..............................................................................................................................409
SIP Send Line................................................................................................................................411
Reserve # in User Name.............................................................................................................413
Password Dial...............................................................................................................................415
Unregister When Reboot.............................................................................................................417
100 Reliable Retransmission .......................................................................................................419
Reboot in Talking..........................................................................................................................421
Configuring Advanced Features...........................................423
Remote Phone Book ....................................................................................................................424
Customizing Remote Phone Book Template File................................................................424
LDAP..............................................................................................................................................431
Busy Lamp Field (BLF).................................................................................................................445
BLF List ..........................................................................................................................................459
Hide Features Access Code.......................................................................................................466
Automatic Call Distribution (ACD) .............................................................................................468
Shared Call Appearance (SCA) ................................................................................................475
Bridge Lines Appearance (BLA) ................................................................................................487
Message Waiting Indicator ........................................................................................................490
Short Message Service (SMS) ...................................................................................................496

Table of Contents
xvii
Multicast Paging ..........................................................................................................................497
Sending RTP Stream............................................................................................................. 497
Receiving RTP Stream ..........................................................................................................510
Call Recording .............................................................................................................................515
Call Recording (for SIP-T48G/T46G/T42G/T41P/T40P/T29G/T27P/T23P/T23G/T21(P) E2 IP
Phones)..................................................................................................................................515
Call Recording (for CP860 IP Phones) ................................................................................. 523
Hot Desking..................................................................................................................................523
Logon Wizard ...............................................................................................................................531
Action URL ....................................................................................................................................534
Action URI.....................................................................................................................................554
Configuring Trusted IP Address for Action URI...................................................................559
Scenario A - Capturing the Current Screen of the Phone.................................................562
Scenario B - Placing a Call via Web User Interface..........................................................563
Server Redundancy.....................................................................................................................564
Server Domain Name Resolution........................................................................................578
Static DNS Cache ........................................................................................................................582
VLAN .............................................................................................................................................590
LLDP .......................................................................................................................................591
CDP ........................................................................................................................................594
Manual Configuration for VLAN..........................................................................................596
DHCP VLAN ...........................................................................................................................600
VPN................................................................................................................................................602
Voice Quality Monitoring ............................................................................................................606
RTCP-XR..................................................................................................................................607
VQ-RTCPXR............................................................................................................................ 608
Quality of Service ........................................................................................................................625
Network Address Translation .....................................................................................................629
NAT Types..............................................................................................................................629
NAT Traversal ........................................................................................................................630
Keep Alive.............................................................................................................................636
Rport ......................................................................................................................................639
Real-Time Transport Protocol.......................................................................................................640
TR-069 Device Management ......................................................................................................642
IPv6 Support .................................................................................................................................647
Configuring Audio Features ..................................................659
Ring Tones ....................................................................................................................................659
Distinctive Ring Tones ..................................................................................................................664
Tones .............................................................................................................................................671
Voice Mail Tone............................................................................................................................678
Headset Prior ...............................................................................................................................680
Dual Headset...............................................................................................................................682
Sending Volume...........................................................................................................................683

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xviii
Audio Codecs ..............................................................................................................................685
Acoustic Clarity Technology........................................................................................................695
Acoustic Echo Cancellation ................................................................................................. 695
Background Noise Suppression..........................................................................................696
Automatic Gain Control .......................................................................................................696
Voice Activity Detection .......................................................................................................696
Comfort Noise Generation ..................................................................................................698
Jitter Buffer ............................................................................................................................699
Configuring Security Features...............................................703
User Password .............................................................................................................................703
Administrator Password ..............................................................................................................705
Auto-Logout Time.........................................................................................................................706
Phone Lock ...................................................................................................................................708
Transport Layer Security..............................................................................................................719
Secure Real-Time Transport Protocol..........................................................................................729
Encrypting Configuration Files ...................................................................................................732
802.1X Authentication .................................................................................................................737
Troubleshooting.....................................................................749
Troubleshooting Methods ...........................................................................................................749
Viewing Log Files..................................................................................................................749
Capturing Packets ................................................................................................................764
Enabling Watch Dog Feature ..............................................................................................766
Getting Information from Status Indicators........................................................................768
Analyzing Configuration File ...............................................................................................768
Troubleshooting Solutions ...........................................................................................................772
IP Address Issues..................................................................................................................772
Audio Issues ..........................................................................................................................773
Wireless Issues......................................................................................................................774
Upgrading Issues .................................................................................................................774
Provisioning Issues................................................................................................................775
Resetting Issues ....................................................................................................................776
Rebooting Issues...................................................................................................................780
Protocols and Ports Issues....................................................................................................783
Display Issues .......................................................................................................................786
Time and Date Issues...........................................................................................................786
System Log Issues.................................................................................................................786
Phone Book Issues ................................................................................................................787
Password Issues....................................................................................................................787
Other Issues ..........................................................................................................................787
Appendix ...............................................................................791

Table of Contents
xix
Appendix A: Glossary.................................................................................................................791
Appendix B: Time Zones.............................................................................................................793
Appendix C: Trusted Certificates ...............................................................................................794
Appendix D: Configuring DSS Key.............................................................................................796
Appendix E: Auto Provisioning Flowchart (Keep user personalized configuration settings)821
Appendix F: Configurations Defined Never be Saved to <MAC>-local.cfg file..................822
Appendix G: SIP (Session Initiation Protocol) ...........................................................................829
RFC and Internet Draft Support ..........................................................................................830
SIP Request............................................................................................................................833
SIP Header ............................................................................................................................833
SIP Responses .......................................................................................................................835
SIP Session Description Protocol (SDP) Usage ..................................................................837
Appendix H: SIP Call Flows ........................................................................................................838
Successful Call Setup and Disconnect ...............................................................................838
Unsuccessful Call Setup—Called User is Busy ..................................................................841
Unsuccessful Call Setup—Called User Does Not Answer ................................................843
Successful Call Setup and Call Hold..................................................................................845
Successful Call Setup and Call Waiting .............................................................................848
Call Transfer without Consultation ......................................................................................853
Call Transfer with Consultation............................................................................................856
Always Call Forward............................................................................................................861
Busy Call Forward ................................................................................................................864
No Answer Call Forward .....................................................................................................867
Call Conference....................................................................................................................870
Index ......................................................................................875

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