Yealink T46G Skype For Business Edition Service manual

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Copyright
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,
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but not for redistribution. No parts of this publication may be subject to alteration, modification or
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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
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TECHNOLOGY CO.,LTD. shall not be liable for errors contained herein nor for incidental or consequential
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Declaration of Conformity
Hereby, Yealink(Xiamen) Network Technology CO., LTD. declares that this phone is in conformity with
the essential requirements and other relevant provisions of the CE, FCC.
Statements of compliance can be obtained by contacting suppo[email protected].
CE Mark Warning
These devices are marked with the CE mark in compliance with EC Directives 2014/35/EU and 2014/30/EU.

Part 15 FCC Rules
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, and
2. This device must accept any interference received, including interference that may cause undesired operation.
Industry Canada (IC)
This Class [B] digital apparatus complies with Canadian ICES-003 Rules.
Class B Digital Device or Peripheral
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.
WEEE Warning
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.
Customer Feedback
We are striving to improve our documentation quality and we appreciate your feedback. Email your
opinions and comments to [email protected].

GNU GPL INFORMATION
Yealink Skype for Business 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
About This Guide
This guide is intended for administrators who need to properly deploy Yealink Skype for
Business phones. It provides details on the functionality and configuration of phones.
Many of the features described in this guide involve network settings, which could affect the
Skype for Business phone’s performance in the network. So an understanding of IP networking
and a prior knowledge of IP telephony concepts are necessary.
Documentations
This guide covers T48G/T46G/T42G/T41P/T40P Skype for Business phones. The following
related documents are available:
Quick Start Guides, which describe how to assemble Skype for Business phones and
configure the most basic features available on Skype for Business phones.
User Guides, which describe the basic and advanced features available on Skype for
Business phones.
Auto Provisioning Guide, which describes how to provision Skype for Business 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.
Deployment Guide, which describes how to deploy phones in a Microsoft Skype for
Business Server environment.
Updating Phone Firmware from Microsoft Skype for Business Server Guide, which
describes how to upgrade firmware via Skype for Business Server.
For support or service, please contact your Yealink reseller or go to Yealink Technical Support
online: http://support.yealink.com/ .

Yealink Skype for Business HD IP Phones Administrator Guide
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Conventions Used in Yealink Documentations
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 they are involved in a
procedure or user action (e.g., Click on Security->License).
Also used to emphasize text (e.g., Configuration File).
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 Skype for Business phone to Perform the Auto Provisioning ).
Blue Text
Used for cross references to other sections within this
documentation (e.g., refer to Troubleshooting).
Blue Text in Italics
Used for hyperlinks to Yealink resources outside of this
documentation such as the Yealink documentations (e.g.,
Yealink_Skype_for_Business_HD_IP_Phones_Auto_Provisioning_Guide
).
In This Guide
The information detailed in this guide is applicable to the Skype for Business phones running
firmware version 8 or higher. The firmware format is like x.x.x.x.rom. The second x from left must
be greater than or equal to 8 (e.g., the firmware version of T46G Skype for Business phone:
28.8.0.50.rom). This administrator guide includes the following chapters:
Chapter 1, “Product Overview” describes the SIP components and Skype for Business
phones.
Chapter 2, “Getting Started” describes how to install and connect Skype for Business
phones, configuration methods and resource files.
Chapter 3, “Configuring Basic Features” describes how to configure the basic features on
Skype for Business phones.
Chapter 4, “Configuring Advanced Features” describes how to configure the advanced
features on Skype for Business phones.
Chapter 5, “Configuring Audio Features” describes how to configure the audio features on
Skype for Business phones.
Chapter 6, “Configuring Security Features” describes how to configure the security features

About This Guide
vii
on Skype for Business phones.
Chapter 7, “Troubleshooting” describes how to troubleshoot Skype for Business phones
and provides some common troubleshooting solutions.
Chapter 8, “Appendix” provides the glossary, reference information about Skype for
Business phones compliant with RFC 3261 , SIP call flows and the sample configuration files.
Summary of Changes
This section describes the changes to this guide for each release and guide version.
Changes for Release 8, Guide Version 8.50
The following sections are new for this version:
DHCP Option 160 and Option 161 on page 34
Bluetooth on page 91
Remember Password on page 80
Hotline on page 134
Monitoring Status Changes using Line Key LED Indicator on page 140
Private Line Ring Tone on page 267
History Record Contacts Avatar on page 157
Music on Hold on page 180
Call Forward on page 180
Monitoring Status Changes using EXP Key LED Indicator on page 216
Quality of Experience on page 249
Private Line Ring Tone on page 267
Sending Volume on page 281
Memory Information on page 335
Skype for Business Status on page 336
Memory Information on page 335
Major update has occurred to the following sections:
Sign-in on page 68
Key As Send on page 125
Viewing Log Files on page 339
BToE on page 211

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Changes for Release 8, Guide Version 8.21
This version is updated to incorporate T46G, T42G, T41P and T40P Skype for Business phones.
And T22/T22P Skype for Business phones are removed from version 8.
The following sections are new for this version:
Conventions Used in Yealink Documentations on page vi
Expansion Module on page 9
Contrast on page 87
Sign out on page 83
Updating Status Automatically on page 93
Loading Language Packs on page 116
Directory on page 137
Pre Dial Tone on page 164
Boss-Admin Feature on page 201
Calendar on page 205
EXP40 Expansion Module on page 214
Multicast Paging on page 219
Action URI on page 228
Voice Mail Tone on page 276
Skype for Business Feature License on page 299
Major update has occurred to the following sections:
Physical Features of Skype for Business Phones on page 4
Connecting the Skype for Business Phones on page 11
Reading Icons on page 18
Configuration Files on page 21
PPPoE on page 45
Sign-in on page 68
Save Call Log on page 153
E911 on page 198
BToE on page 211
LLDP on page 232
Phone Lock on page 305
802.1X Authentication on page 324
Viewing Log Files on page 339

Table of Contents
ix
Table of Contents
About This Guide ...................................................................... v
Documentations.................................................................................................................................v
Conventions Used in Yealink Documentations .................................................................................. vi
In This Guide .....................................................................................................................................vi
Summary of Changes ....................................................................................................................... vii
Changes for Release 8, Guide Version 8.50 ............................................................................... vii
Changes for Release 8, Guide Version 8.21 .............................................................................. viii
Table of Contents..................................................................... ix
Product Overview...................................................................... 1
VoIP Principle.....................................................................................................................................1
SIP Components.................................................................................................................................2
Phone Models ....................................................................................................................................3
Physical Features of Skype for Business Phones ..........................................................................4
Key Features of Skype for Business Phones.................................................................................7
Expansion Module..............................................................................................................................9
Getting Started........................................................................ 11
Connecting the Skype for Business Phones ......................................................................................11
Attaching the Stand and the Optional Wall Mount Bracket.......................................................12
Connecting the Handset and Optional Headset........................................................................14
Connecting the Power and Network .........................................................................................15
Initialization Process Overview .........................................................................................................16
Verifying Startup ..............................................................................................................................18
Reading Icons...................................................................................................................................18
Configuration Methods ....................................................................................................................20
Phone User Interface................................................................................................................. 21
Web User Interface ...................................................................................................................21
Configuration Files ....................................................................................................................21
Obtaining Configuration Files and Resource Files ............................................................................22
Provisioning Server ..........................................................................................................................23
Supported Provisioning Protocols.............................................................................................23
Setting up the Provisioning Server ............................................................................................24
Deploying Phones from the Provisioning Server .......................................................................24
Configuring Basic Network Parameters ............................................................................................26

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DHCP ........................................................................................................................................26
DHCP Option ............................................................................................................................ 30
Configuring Network Parameters Manually ..............................................................................40
PPPoE........................................................................................................................................45
Configuring Transmission Methods of the Internet Port and PC Port........................................48
Configuring PC Port Mode........................................................................................................52
Branch Office Resiliency ...................................................................................................................54
Upgrading Firmware ........................................................................................................................54
Upgrading Firmware via Web User Interface.............................................................................55
Upgrading Firmware from the Provisioning Server.................................................................... 56
Updating Phone Firmware from Skype for Business Server ....................................................... 61
Configuring Basic Features ..................................................... 67
Sign-in .............................................................................................................................................68
User Sign-in ..............................................................................................................................69
PIN Authentication.................................................................................................................... 72
Web Sign-in ..............................................................................................................................75
Remember Password........................................................................................................................ 80
Sign out ...........................................................................................................................................83
Power Indicator LED.........................................................................................................................84
Contrast ...........................................................................................................................................87
Backlight ..........................................................................................................................................89
Bluetooth .........................................................................................................................................91
Updating Status Automatically.........................................................................................................93
Web Server Type.............................................................................................................................. 95
Time and Date..................................................................................................................................99
NTP Time Server......................................................................................................................100
Time and Date Settings........................................................................................................... 105
Daylight Saving Time ..............................................................................................................108
Language .......................................................................................................................................115
Loading Language Packs.........................................................................................................116
Specifying the Language to Use.............................................................................................. 122
Key As Send ...................................................................................................................................125
Dial Plan.........................................................................................................................................129
Dial-now .................................................................................................................................130
Hotline ...........................................................................................................................................134
Directory ........................................................................................................................................137
Skype for Business Directory ................................................................................................... 137
Local Directory ........................................................................................................................ 142
Call Log ..........................................................................................................................................153
Save Call Log...........................................................................................................................153
Missed Call Log.......................................................................................................................155
History Record Contacts Avatar ..............................................................................................157
Dial Search Delay ...........................................................................................................................159

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xi
Live Dialpad ...................................................................................................................................160
Call Waiting....................................................................................................................................162
Pre Dial Tone..................................................................................................................................164
Redial Tone ....................................................................................................................................165
Ringer Device for Headset..............................................................................................................167
Auto Answer...................................................................................................................................168
Always On Line...............................................................................................................................171
Busy Tone Delay............................................................................................................................. 173
Return Code When Refuse .............................................................................................................174
Early Media ....................................................................................................................................176
180 Ring Workaround ....................................................................................................................176
Call Hold ........................................................................................................................................178
Music on Hold......................................................................................................................... 180
Call Forward ...................................................................................................................................180
Allow Trans Exist Call......................................................................................................................185
Call Number Filter ..........................................................................................................................186
DTMF .............................................................................................................................................188
Methods of Transmitting DTMF Digit......................................................................................189
Suppress DTMF Display...........................................................................................................190
Transfer via DTMF ................................................................................................................... 192
Play Local DTMF Tone............................................................................................................. 194
Allow Mute.....................................................................................................................................195
Voice Mail without PIN...................................................................................................................197
E911 ...............................................................................................................................................198
E911 Location Tip.................................................................................................................... 199
Boss-Admin Feature .......................................................................................................................201
Calendar......................................................................................................................................... 205
Setting up a Skype Conference in Outlook..............................................................................205
Setting up an Appointment in Outlook ...................................................................................205
Setting up a Meeting in Outlook.............................................................................................206
Setting up an Event in Outlook ...............................................................................................207
Using the Calendar..................................................................................................................208
BToE...............................................................................................................................................211
EXP40 Expansion Module...............................................................................................................214
Assigning Contacts to EXP40 ..................................................................................................214
Monitoring Status Changes using EXP Key LED Indicator........................................................216
Configuring Advanced Features.............................................219
Multicast Paging ............................................................................................................................219
Sending RTP Stream................................................................................................................219
Receiving RTP Stream .............................................................................................................223
Action URI ......................................................................................................................................228
Configuring Trusted IP Address for Action URI .......................................................................228
Capturing the Current Screen of the Phone ............................................................................230

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VLAN..............................................................................................................................................231
LLDP........................................................................................................................................232
CDP.........................................................................................................................................236
Manual Configuration for VLAN..............................................................................................238
DHCP VLAN ............................................................................................................................ 243
Quality of Service ........................................................................................................................... 246
Quality of Experience ..................................................................................................................... 249
IPv6 Support ..................................................................................................................................253
Configuring Audio Features...................................................263
Phone Ring Tones .......................................................................................................................... 263
Private Line Ring Tone.................................................................................................................... 267
Tones .............................................................................................................................................269
Voice Mail Tone ............................................................................................................................. 276
Headset Prior .................................................................................................................................277
Dual Headset.................................................................................................................................. 279
Sending Volume.............................................................................................................................281
Audio Codecs.................................................................................................................................282
Acoustic Clarity Technology ...........................................................................................................290
Acoustic Echo Cancellation .....................................................................................................290
Background Noise Suppression ..............................................................................................291
Automatic Gain Control ..........................................................................................................291
Voice Activity Detection ..........................................................................................................291
Comfort Noise Generation ......................................................................................................293
Jitter Buffer .............................................................................................................................294
Configuring Security Features................................................299
Skype for Business Feature License ................................................................................................ 299
User Password................................................................................................................................ 301
Administrator Password .................................................................................................................302
Auto-Logout Time..........................................................................................................................304
Phone Lock ....................................................................................................................................305
Account Lock..................................................................................................................................308
Transport Layer Security.................................................................................................................310
Encrypting Configuration Files .......................................................................................................319
802.1X Authentication....................................................................................................................324
Troubleshooting.....................................................................335
Troubleshooting Methods..............................................................................................................335
Memory Information...............................................................................................................335
Skype for Business Status........................................................................................................ 336
Viewing Log Files ....................................................................................................................339

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xiii
Capturing Packets ...................................................................................................................348
Enabling Watch Dog Feature ..................................................................................................351
Getting Information from Status Indicators.............................................................................352
Analyzing Configuration File ...................................................................................................352
Troubleshooting Solutions .............................................................................................................354
IP Address Issues.....................................................................................................................354
Audio Issues............................................................................................................................355
Upgrading Issues ....................................................................................................................356
Provisioning Issues..................................................................................................................358
Resetting Issues ...................................................................................................................... 358
Rebooting Issues.....................................................................................................................359
Protocols and Ports Issues ......................................................................................................360
Display Issues..........................................................................................................................362
Directory Issues.......................................................................................................................362
Time and Date Issues ..............................................................................................................362
System Log Issues ................................................................................................................... 362
Password Issues ......................................................................................................................363
Other Issues ............................................................................................................................363
Appendix................................................................................365
Appendix A: Glossary .....................................................................................................................365
Appendix B: Time Zones.................................................................................................................366
Appendix C: Trusted Certificates .................................................................................................... 368
Appendix D: SIP (Session Initiation Protocol).................................................................................. 369
RFC and Internet Draft Support...............................................................................................370
SIP Request .............................................................................................................................373
SIP Header ..............................................................................................................................374
SIP Responses ......................................................................................................................... 375
SIP Session Description Protocol (SDP) Usage.........................................................................378
Appendix E: SIP Call Flows..............................................................................................................378
Successful Call Setup and Disconnect .....................................................................................378
Unsuccessful Call Setup—Called User is Busy........................................................................... 381
Unsuccessful Call Setup—Called User Does Not Answer..........................................................383
Successful Call Setup and Call Hold ........................................................................................385
Successful Call Setup and Call Waiting....................................................................................388
Call Transfer without Consultation .......................................................................................... 392
Call Transfer with Consultation................................................................................................395
Call Conference.......................................................................................................................400
Index ......................................................................................405

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Product Overview
1
Product Overview
This chapter contains the following information about Skype for Business phones:
VoIP Principle
SIP Components
Phone Models
VoIP Principle
VoIP
VoIP (Voice over Internet Protocol) is a technology using the Internet Protocol instead of
traditional Public Switch Telephone Network (PSTN) technology for voice communications.
It is a family of technologies, methodologies, communication protocols, and transmission
techniques for the delivery of voice communications and multimedia sessions over IP networks.
The H.323 and Session Initiation Protocol (SIP) are two popular VoIP protocols that are found in
widespread implementation.
H.323
H.323 is a recommendation from the ITU Telecommunication Standardization Sector (ITU-T)
that defines the protocols to provide audio-visual communication sessions on any packet
network. The H.323 standard addresses call signaling and control, multimedia transport and
control, and bandwidth control for point-to-point and multi-point conferences.
It is widely implemented by voice and video conference equipment manufacturers, is used
within various Internet real-time applications such as GnuGK and NetMeeting and is widely
deployed by service providers and enterprises for both voice and video services over IP
networks.
SIP
SIP (Session Initiation Protocol) is the Internet Engineering Task Force’s (IETF’s) standard for
multimedia conferencing over IP. It is an ASCII-based, application-layer control protocol
(defined in RFC 3261) that can be used to establish, maintain, and terminate calls between two
or more endpoints. Like other VoIP protocols, SIP is designed to address functions of signaling
and session management within a packet telephony network. Signaling allows call information
to be carried across network boundaries. Session management provides the ability to control
attributes of an end-to-end call.

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SIP provides capabilities to:
Determine the location of the target endpoint -- SIP supports address resolution, name
mapping, and call redirection.
Determine media capabilities of the target endpoint -- Via Session Description Protocol
(SDP), SIP determines the “lowest level” of common services between endpoints.
Conferences are established using only media capabilities that can be supported by all
endpoints.
Determine the availability of the target endpoint -- A call cannot be completed because
the target endpoint is unavailable, SIP determines whether the called party is already on
the Skype for Business phone or does not answer in the allotted number of rings. It then
returns a message indicating why the target endpoint is unavailable.
Establish a session between the origin and target endpoint -- The call can be completed,
SIP establishes a session between endpoints. SIP also supports mid-call changes, such as
the addition of another endpoint to the conference or the change of a media characteristic
or codec.
Handle the transfer and termination of calls -- SIP supports the transfer of calls from one
endpoint to another. During a call transfer, SIP simply establishes a session between the
transferee and a new endpoint (specified by the transferring party) and terminates the
session between the transferee and the transferring party. At the end of a call, SIP
terminates the sessions between all parties.
SIP Components
SIP is a peer-to-peer protocol. The peers in a session are called User Agents (UAs). A user agent
can function as one of following roles:
User Agent Client (UAC) -- A client application that initiates the SIP request.
User Agent Server (UAS) -- A server application that contacts the user when a SIP request is
received and that returns a response on behalf of the user.
User Agent Client (UAC)
The UAC is an application that initiates up to six feasible SIP requests to the UAS. The six
requests issued by the UAC are: INVITE, ACK, OPTIONS, BYE, CANCEL and REGISTER. When the
SIP session is being initiated by the UAC SIP component, the UAC determines the information
essential for the request, which is the protocol, the port and the IP address of the UAS to which
the request is being sent. This information can be dynamic and will make it challenging to put
through a firewall. For this reason, it may be recommended to open the specific application type
on the firewall. The UAC is also capable of using the information in the request URI to establish
the course of the SIP request to its destination, as the request URI always specifies the host
which is essential. The port and protocol are not always specified by the request URI. Thus if the
request does not specify a port or protocol, a default port or protocol is contacted. It may be
preferential to use this method when not using an application layer firewall. Application layer

Product Overview
3
firewalls like to know what applications are flowing through which ports and it is possible to use
content types of other applications other than the one you are trying to let through what has
been denied.
User Agent Server (UAS)
UAS is a server that hosts the application responsible for receiving the SIP requests from a UAC,
and on reception it returns a response to the request back to the UAC. The UAS may issue
multiple responses to the UAC, not necessarily a single response. Communication between UAC
and UAS is client/server and peer-to–peer.
Typically, a SIP endpoint is capable of functioning as both a UAC and a UAS, but it functions only
as one or the other per transaction. Whether the endpoint functions as a UAC or a UAS depends
on the UA that initiates the request.
Phone Models
This section introduces T48G/T46G/T42G/T41P/T40P Skype for Business phone models. They
are designed to work with Skype for Business Server. These Skype for Business phones are
characterized by a large number of functions, which simplify business communication with a
high standard of security.
The T48G/T46G/T42G/T41P/T40P Skype for Business phones provide a powerful and flexible IP
communication solution for Ethernet TCP/IP networks, delivering excellent voice quality. When
these phones register Skype for Business accounts, you can interact with your Skype for
Business contacts list on your phones through Microsoft’s Active Directory.
Skype for Business phones comply with the SIP standard (RFC 3261), and they can only be used
within a network that supports this model of phone.
For a list of key features available on Yealink Skype for Business phones running the latest
firmware, refer to Physical Features of Skype for Business Phones on page 4.
In order to operate as SIP endpoints in your network successfully, Skype for Business phones
must meet the following requirements:
A working IP network is established.
VoIP gateways are configured for SIP.
The latest (or compatible) firmware of Skype for Business phone is available.
The Skype for Business Server is active and configured to receive and send SIP messages.

Yealink Skype for Business HD IP Phones Administrator Guide
4
Physical Features of Skype for Business Phones
This section lists the available physical features of T48G/T46G/T42G/T41P/T40P Skype for
Business phones.
T48G
Physical Features:
-7” 800 x 480 pixel color touch screen with backlight
-24 bit depth color
-1 Skype for Business account
-HD Voice: HD Codec, HD Handset, HD Speaker
-26 keys including 7 feature keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100/1000Mbps Ethernet ports
-4 LEDs: 1*power, 1*mute, 1*headset, 1*speakerphone
-Power adapter: AC 100~240V input and DC 5V/2A output
-Power over Ethernet (IEEE 802.3af)
-Built-in USB port, support Bluetooth headset
-Wall Mount

Product Overview
5
T46G
Physical Features:
-4.3” 480 x 272 pixel color display with backlight
-24 bit depth color
-1 Skype for Business account
-HD Voice: HD Codec, HD Handset, HD Speaker
-36 dedicated hard keys and 4 context-sensitive soft keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100/1000Mbps Ethernet ports
-14 LEDs: 1*power, 10*line, 1*mute, 1*headset, 1*speakerphone
-Power adapter: AC 100~240V input and DC 5V/2A output
-Power over Ethernet (IEEE 802.3af)
-Built-in USB port, support Bluetooth headset
-Wall Mount
T42G

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Physical Features:
-192 x 64 graphic LCD
-1 Skype for Business account
-HD Voice: HD Codec, HD Handset, HD Speaker
-30 dedicated hard keys and 4 context-sensitive soft keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100/1000Mbps Ethernet ports
-1*RJ12 (6P6C) EHS36 headset adapter port
-10 LEDs: 1*power, 6*line, 1*mute, 1*headset, 1*speakerphone
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)
-Wall Mount
T41P
Physical Features:
-192 x 64 graphic LCD
-1 Skype for Business account
-HD Voice: HD Codec, HD Handset, HD Speaker
-30 dedicated hard keys and 4 context-sensitive soft keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100Mbps Ethernet ports
-1*RJ12 (6P6C) EHS36 headset adapter port
-10 LEDs: 1*power, 6*line, 1*mute, 1*headset, 1*speakerphone