Yealink Yealink SIP-T48G Service manual

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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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THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS GUIDE ARE
SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND
RECOMMENDATIONS IN THIS GUIDE ARE BELIEVED TO BE ACCURATE AND PRESENTED
WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL
RESPONSIBILITY FOR THEIR APPLICATION OF PRODUCTS.
YEALINK NETWORK TECHNOLOGY CO., LTD. MAKES NO WARRANTY OF ANY KIND WITH
REGARD TO THIS GUIDE, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Yealink Network Technology
CO., LTD. shall not be liable for errors contained herein nor for incidental or consequential
damages in connection with the furnishing, performance, or use of this guide.
Hereby, Yealink Network Technology CO., LTD. declares that this phone is in conformity
with the essential requirements and other relevant provisions of the CE, FCC.
This device is marked with the CE mark in compliance with EC Directives 2006/95/EC and 2004/108/EC.
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, T42G, T41P, T29G, T27P, T23P/G and T21(P) E2 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.
<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://www.yealink.com/Support.aspx.
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 and
the configuration methods.
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

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
vi
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, “Resource Files” describes the resource files that can be downloaded
by IP phones.
Chapter 9, “Troubleshooting” describes how to troubleshoot IP phones and
provides some common troubleshooting solutions.
Chapter 10, “Appendix” provides the glossary, reference information about IP
phones compliant with RFC 3261, SIP call flows and the sample configuration files.
This section describes the changes to this guide for each release and guide version.
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 23
Configuration Files on page 26
Power Indicator LED on page 58
Backlight on page 70
Phone Lock on page 84
Time and Date on page 92
Auto Answer on page 167
Return Code When Refuse on page 193
DTMF on page 265
Appendix B: Time Zones on page 547
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 66

About This Guide
vii
Hide Features Access Code on page 329
Major updates have occurred to the following sections:
DHCP on page 30
Call Display on page 74
Input Method Customization on page 113
BLF List on page 322
IPv6 Support on page 464
Viewing Log Files on page 523

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viii

Table of Contents
ix
About This Guide ...................................................................... v
Documentations...............................................................................................................................v
In This Guide ....................................................................................................................................v
Summary of Changes .................................................................................................................... vi
Changes for Release 80, Guide Version 80.20...................................................................... vi
Changes for Release 80, Guide Version 80.6........................................................................ vi
Table of Contents .................................................................... ix
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......................................................................................................12
Getting Started....................................................................... 15
Connecting the IP Phones .............................................................................................................15
Initialization Process Overview ....................................................................................................21
Verifying Startup ............................................................................................................................22
Reading Icons ................................................................................................................................23
Configuration Methods................................................................................................................. 25
Phone User Interface..............................................................................................................26
Web User Interface ................................................................................................................26
Configuration Files..................................................................................................................26
Provisioning Server........................................................................................................................ 28
Supported Provisioning Protocols .........................................................................................28
Setting up the Provisioning Server........................................................................................28
Deploying Phones from the Provisioning Server ................................................................. 29
Configuring Basic Network Parameters ......................................................................................30
DHCP .......................................................................................................................................30
Configuring Network Parameters Manually ........................................................................35
PPPoE .......................................................................................................................................41
Configuring Transmission Methods of the Internet Port and PC Port .................................44
Configuring PC Port Mode.....................................................................................................47
Upgrading Firmware.....................................................................................................................49

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
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Configuring Basic Features .................................................... 57
Power Indicator LED ......................................................................................................................58
Notification Popups........................................................................................................................62
Contrast ..........................................................................................................................................65
Wallpaper.......................................................................................................................................66
Backlight.........................................................................................................................................70
Call Display ....................................................................................................................................74
Web Server Type............................................................................................................................77
User Password ...............................................................................................................................80
Administrator Password ................................................................................................................82
Phone Lock .....................................................................................................................................84
Time and Date ...............................................................................................................................92
Language .....................................................................................................................................104
Loading Language Packs .................................................................................................... 104
Specifying the Language to Use.........................................................................................111
Input Method Customization ...................................................................................................... 113
Logo Customization.....................................................................................................................118
Softkey Layout..............................................................................................................................121
Key as send..................................................................................................................................127
Dial Plan........................................................................................................................................131
Replace Rule .........................................................................................................................132
Dial-now ................................................................................................................................135
Area Code.............................................................................................................................139
Block Out ...............................................................................................................................142
Hotline ..........................................................................................................................................144
Off Hook Hot Line Dialing...........................................................................................................146
Directory .......................................................................................................................................148
Search Source in Dialing.............................................................................................................149
Call Log.........................................................................................................................................151
Missed Call Log ...........................................................................................................................153
Local Directory .............................................................................................................................154
Live Dialpad.................................................................................................................................159
Call Waiting.................................................................................................................................. 161
Auto Redial...................................................................................................................................165
Auto Answer.................................................................................................................................167
Call Completion...........................................................................................................................171
Anonymous Call........................................................................................................................... 172
Anonymous Call Rejection ..........................................................................................................177
Do Not Disturb..............................................................................................................................180
Busy Tone Delay...........................................................................................................................191
Return Code When Refuse ..........................................................................................................193
Early Media.................................................................................................................................. 194
180 Ring Workaround ..................................................................................................................194

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xi
Use Outbound Proxy in Dialog...................................................................................................196
SIP Session Timer ......................................................................................................................... 198
Session Timer ...............................................................................................................................200
Call Hold.......................................................................................................................................203
Call Forward ................................................................................................................................208
Call Transfer .................................................................................................................................227
Network Conference ...................................................................................................................230
Feature Key Synchronization......................................................................................................232
Transfer on Conference Hang Up ..............................................................................................234
Directed Call Pickup....................................................................................................................235
Group Call Pickup........................................................................................................................244
Dialog Info Call Pickup................................................................................................................ 252
ReCall............................................................................................................................................254
Call Park .......................................................................................................................................258
Calling Line Identification Presentation..................................................................................... 262
Connected Line Identification Presentation ..............................................................................264
DTMF.............................................................................................................................................265
Suppress DTMF Display .............................................................................................................. 271
Transfer via DTMF ........................................................................................................................273
Intercom........................................................................................................................................275
Outgoing Intercom Calls...................................................................................................... 275
Incoming Intercom Calls ...................................................................................................... 279
Configuring Advanced Features...........................................283
Distinctive Ring Tones ..................................................................................................................284
Tones .............................................................................................................................................290
Remote Phone Book ....................................................................................................................297
LDAP..............................................................................................................................................301
Busy Lamp Field...........................................................................................................................313
BLF List .......................................................................................................................................... 322
Hide Features Access Code.......................................................................................................329
Automatic Call Distribution .........................................................................................................331
Message Waiting Indicator ........................................................................................................336
Multicast Paging ..........................................................................................................................341
Sending RTP Stream.............................................................................................................342
Receiving RTP Stream ..........................................................................................................351
Call Recording .............................................................................................................................355
Hot Desking..................................................................................................................................361
Action URL ....................................................................................................................................365
Action URI.....................................................................................................................................381
Capturing the Current Screen of the Phone....................................................................... 385
Server Redundancy.....................................................................................................................386
SIP Server Domain Name Resolution.................................................................................. 395
Static DNS Cache ........................................................................................................................399

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xii
LLDP...............................................................................................................................................407
CDP ...............................................................................................................................................411
VLAN .............................................................................................................................................413
VPN................................................................................................................................................421
Voice Quality Monitoring ............................................................................................................424
RTCP-XR..................................................................................................................................424
VQ-RTCPXR............................................................................................................................425
Quality of Service ........................................................................................................................442
Network Address Translation .....................................................................................................445
802.1X Authentication .................................................................................................................449
TR-069 Device Management ......................................................................................................458
IPv6 Support ................................................................................................................................. 464
Configuring Audio Features ..................................................473
Headset Prior ...............................................................................................................................473
Dual Headset...............................................................................................................................474
Audio Codecs ..............................................................................................................................476
Acoustic Clarity Technology........................................................................................................485
Acoustic Echo Cancellation ................................................................................................. 485
Background Noise Suppression..........................................................................................487
Automatic Gain Control .......................................................................................................487
Voice Activity Detection .......................................................................................................487
Comfort Noise Generation ..................................................................................................488
Jitter Buffer ............................................................................................................................490
Configuring Security Features...............................................493
Transport Layer Security.............................................................................................................. 493
Secure Real-Time Transport Protocol..........................................................................................502
Encrypting Configuration Files ...................................................................................................505
Resource Files........................................................................511
Replace Rule Template ............................................................................................................... 512
Dial-now Template.......................................................................................................................513
Softkey Layout Template.............................................................................................................514
Directory Template ......................................................................................................................515
Super Search Template...............................................................................................................516
Local Contact File ........................................................................................................................518
Remote XML Phone Book............................................................................................................520
Troubleshooting.....................................................................523
Troubleshooting Methods ...........................................................................................................523

Table of Contents
xiii
Viewing Log Files..................................................................................................................523
Capturing Packets ................................................................................................................533
Enabling Watch Dog Feature ..............................................................................................534
Getting Information from Status Indicators........................................................................535
Analyzing Configuration File ...............................................................................................535
Troubleshooting Solutions ...........................................................................................................538
Why is the LCD screen blank? .............................................................................................538
Why doesn’t the IP phone get an IP address? ...................................................................538
Why does the IP phone display “No Service”? .................................................................539
How do I find the basic information of the IP phone?.......................................................539
Why doesn’t the IP phone upgrade firmware successfully?.............................................539
Why doesn’t the IP phone display time and date correctly? ...........................................539
Why do I get poor sound quality during a call? ................................................................540
What is the difference between a remote phone book and a local phone book? .......540
What is the difference among user name, register name and display name? .............540
How to reboot the IP phone remotely? ..............................................................................540
Why does the IP phone use DOB format logo file instead of popular BMP, JPG and so on?
................................................................................................................................................541
How to increase or decrease the volume?........................................................................ 541
What will happen if I connect both PoE cable and power adapter? Which has the higher
priority?..................................................................................................................................541
What is auto provisioning? ..................................................................................................541
What is PnP? ..........................................................................................................................541
Why doesn’t the IP phone update the configuration? ......................................................542
What do “on code” and “off code” mean? .......................................................................542
How to solve the IP conflict problem? ................................................................................542
How to reset the IP phone to factory configurations?.......................................................542
How to restore the administrator password? ....................................................................543
Appendix ...............................................................................545
Appendix A: Glossary.................................................................................................................545
Appendix B: Time Zones.............................................................................................................547
Appendix C: Trusted Certificates ...............................................................................................548
Appendix D: Configuring DSS Key.............................................................................................549
Appendix E: SIP (Session Initiation Protocol) ............................................................................560
RFC and Internet Draft Support ..........................................................................................561
SIP Request............................................................................................................................564
SIP Header ............................................................................................................................ 564
SIP Responses .......................................................................................................................566
SIP Session Description Protocol (SDP) Usage ..................................................................568
Appendix F: SIP Call Flows .........................................................................................................569
Successful Call Setup and Disconnect ...............................................................................569
Unsuccessful Call Setup—Called User is Busy ..................................................................572
Unsuccessful Call Setup—Called User Does Not Answer ................................................574

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xiv
Successful Call Setup and Call Hold.................................................................................. 577
Successful Call Setup and Call Waiting .............................................................................580
Call Transfer without Consultation ......................................................................................584
Call Transfer with Consultation............................................................................................589
Always Call Forward............................................................................................................594
Busy Call Forward ................................................................................................................597
No Answer Call Forward .....................................................................................................600
Call Conference.................................................................................................................... 603
Index ......................................................................................609

Product Overview
1
This chapter contains the following information about IP phones:
VoIP Principle
SIP Components
SIP IP Phone Models
VoIP
VoIP (Voice over Internet Protocol) is a technology using the Internet Protocol instead of
traditional Public Switch Telephone Network (PSTN) technology for voice
communications.
It is a family of technologies, methodologies, communication protocols, and
transmission techniques for the delivery of voice communications and multimedia
sessions over IP networks. The H.323 and Session Initiation Protocol (SIP) are two
popular VoIP protocols that are found in widespread 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.

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
2
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 IP 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 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

Product Overview
3
preferential to use this method when not using an application layer firewall. Application
layer firewalls like to know what applications are flowing though 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.
This section introduces SIP-T48G, SIP-T46G, SIP-T42G, SIP-T41P, SIP-T29G, SP-T27P,
SIP-T23P/G and SIP-T21(P) E2 IP phone models. These IP phones are endpoints in the
overall network topology, which are designed to interoperate with other compatible
equipments including application servers, media servers, internet-working gateways,
voice bridges, and other endpoints. These IP phones are characterized by a large
number of functions, which simplify business communication with a high standard of
security and can work seamlessly with a large number of SIP PBXs.
SIP-T48G, SIP-T46G, SIP-T42G, SIP-T41P, SIP-T29G, SIP-T27P, SIP-T23P/G and SIP-T21(P) E2 IP
phones provide a powerful and flexible IP communication solution for Ethernet TCP/IP
networks, delivering excellent voice quality. The high-resolution graphic display
supplies content in multiple languages for system status, call log and directory access.
IP phones also support advanced functionalities, including LDAP, Busy Lamp Field, Sever
Redundancy and Network Conference.
The following IP phone models are described:
SIP-T48G
SIP-T46G
SIP-T42G
SIP-T41P
SIP-T29G
SIP-T27P
SIP-T23P/G
SIP-T21(P) E2
IP phones comply with the SIP standard (RFC 3261), and they can only be used within a
network that supports this model of phone.

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
4
For a list of key features available on Yealink IP phones running the latest firmware, refer
to Key Features of IP Phones on page 12.
In order to operate as SIP endpoints in your network successfully, IP phones must meet
the following requirements:
A working IP network is established.
VoIP gateways are configured for SIP.
The latest (or compatible) firmware of IP phones is available.
A call server is active and configured to receive and send SIP messages.
This section lists the available physical features of SIP-T48G, SIP-T46G, SIP-T42G, SIP-T41P,
SIP-T29G, SIP-T27P, SIP-T23P/G and SIP-T21(P) E2 IP phones.
SIP-T48G
Physical Features:
-7” 800 x 480 pixel color touch screen with backlight
-24 bit depth color
-16 VoIP accounts, Broadsoft Validated/Asterisk®Compatible
-HD Voice: HD Codec, HD Handset, HD Speaker
-26 keys including 7 feature keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port

Product Overview
5
-2*RJ45 10/100/1000Mbps Ethernet ports
-1*RJ12 (6P6C) expansion module port
-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
SIP-T46G
Physical Features:
-4.3” 480 x 272 pixel color display with backlight
-24 bit depth color
-16 VoIP accounts, Broadsoft Validated/Asterisk®Compatible
-HD Voice: HD Codec, HD Handset, HD Speaker
-40 keys including 10 line keys
-1*RJ9 (4P4C) handset port
-1*RJ9 (4P4C) headset port
-2*RJ45 10/100/1000Mbps Ethernet ports
-1*RJ12 (6P6C) expansion module port
-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

Administrator’s Guide for SIP-T2_Series_T4_Series IP Phones
6
SIP-T42G
Physical Features:
-192 x 64 graphic LCD
-12 VoIP accounts, Broadsoft Validated/Asterisk®Compatible
-HD Voice: HD Codec, HD Handset, HD Speaker
-34 keys including 6 line 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