Yealink SIP-T2XP Service manual

Copyright
Copyright © 2013 YEALINK NETWORK TECHNOLOGY
Copyright © 2013 Yealink Network Technology CO., LTD. All rights reserved. No parts of this
publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, photocopying, recording, or otherwise, for any purpose, without the express
written permission of Yealink Network Technology CO., LTD. Under the law, reproducing includes
translating into another language or format.
When this publication is made available on media, Yealink Network Technology CO., LTD. gives
its consent to downloading and printing copies of the content provided in this file only for
private use but not for redistribution. No parts of this publication may be subject to alteration,
modification or commercial use. Yealink Network Technology CO., LTD. will not be liable for any
damages arising from use of an illegally modified or altered publication.
Warranty
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.
Declaration of Conformity
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.
CE Mark Warning
This device is marked with the CE mark in compliance with EC Directives 2006/95/EC and 2004/108/EC.
Part 15 FCC Rules
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.

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 [e-mail].

GNU GPL INFORMATION
Yealink SIP-T2xP 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 configure, customize,
manage, and troubleshoot the IP phone system rather than the end-users. It provides
details on the functionality and configuration of the IP phones.
Many of the features described in this guide involve network settings, which could
affect the IP phone performance in the network. So an understanding of IP networking
and prior knowledge of IP telephony concepts are necessary.
Documentations
This guide covers the SIP-T28P, T26P, T22P and T20P IP phones. The following related
documents for SIP-T2xP IP phones are available:
Quick Installation Guides, which describe how to assemble IP phones.
Quick Reference Guides, which describe 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 BroadWorks Environments, which describes how
to configure the 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.
In This Guide
The information detailed in this guide is applicable to the firmware version 71 or higher.
The firmware format likes x.x.x.x.rom. The second x from left must be greater than or
equal to 71 (e.g., the firmware version of SIP-T28P 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

Administrator’s Guide for SIP-T2xP IP Phones
vi
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, “Upgrading Firmware”describes how to upgrade firmware of IP
phones.
Chapter 8, “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.
Summary of Changes
This section describes the changes to this guide for each release and guide version.
Changes for Release 71, Guide Version 71.140
Major updates have occurred to the following sections:
Logo Customization on page 55
Anonymous Call on page 76
Distinctive Ring Tones on page 127
Server Redundancy on page 163
Transport Layer Security on page 207
Secure Real-Time Transport Protocol on page 213
Encrypting Configuration Files on page 215
Local Contact File on page 227
Viewing Log Files on page 231
Capturing Packets on page 234
Changes for Release 71, Guide Version 71.125
Major updates have occurred to the following sections:

About This Guide
vii
Appendix B: Time Zones on page 247
Changes for Release 71, Guide Version 71.120
Major updates have occurred to the following sections:
Configuring DSS Key on page 376
Changes for Release 71, Guide Version 71.110
The following sections are new for this version:
Hot Desking on page 155
TR-069 Device Management on page 189
IPv6 Support on page 191
Major updates have occurred to the following sections:
Configuring Network Parameters Manually on page 22
Softkey Layout on page 57
Directed Call Pickup on page 103
Distinctive Ring Tones on page 127
Automatic Call Distribution on page 143
Action URL on page 160
Server Redundancy on page 162
VLAN on page 172
Transport Layer Security on page 207
Local Contact File on page 227
Changes for Release 70, Guide Version 70
The following sections are new for this version:
Configuring Basic Network Parameters on page 19
Contrast on page 39
Backlight on page 40
Logo Customization on page 55
Softkey Layout on page 57
Key as Send on page 60
Call Log on page 64

Administrator’s Guide for SIP-T2xP IP Phones
viii
Live Dialpad on page 69
Auto Answer on page 73
Call Completion on page 74
Anonymous Call on page 76
Anonymous Call Rejection on page 77
Busy Tone Delay on page 85
Return Code When Refuse on page 86
Early Media on page 87
180 Ring Workaround on page 87
Use Outbound Proxy in Dialog on page 89
SIP Session Timer on page 90
Session Timer on page 91
Call Return on page 112
Transfer via DTMF on page 122
Intercom on page 123
Music on Hold on page 142
Automatic Call Distribution on page 143
Message Waiting Indicator on page 145
Multicast Paging on page 147
Call Recording on page 151
LLDP on page 169
VLAN on page 172
VPN on page 175
Quality of Service on page 177
Configuring Audio Features on page 195
Secure Real-Time Transport Protocol on page 213
Appendix B: Time Zones on page 247
Phone user interface for each feature
Major updates have occurred to the following sections:
Creating Dial Plan on page 31
Transport Layer Security on page 207
Encrypting Configuration Files on page 215
Troubleshooting on page 231
Web user interface for each feature

About This Guide
ix
Changes for Release 70, Guide Version 2.0
The following sections are new for this version:
Dialog-Info Call Pickup on page 110
Web Server Type on page 114
Tones on page 131
Hot Desking on page 155
Action URL on page 160
Action URI on page 159
Resource Files on page 223
Appendix C: Configuration Parameters on page 250
Appendix F: Sample Configuration File on page 441
Major updates have occurred to the following sections:
Creating Dial Plan on page 31
Phone Lock on page 45
Time and Date on page 47
Busy Lamp Field on page 138

Administrator’s Guide for SIP-T2xP IP Phones
x

Table of
Contents
xi
Table of Contents
About This Guide......................................................................... v
Documentations ....................................................................................................................................v
In This Guide ............................................................................................................................................v
Summary of Changes .......................................................................................................................... vi
Changes for Release 71, Guide Version 71.140 ....................................................................... vi
Changes for Release 71, Guide Version 71.125 ....................................................................... vi
Changes for Release 71, Guide Version 71.120 ...................................................................... vii
Changes for Release 71, Guide Version 71.110 ...................................................................... vii
Changes for Release 70, Guide Version 70 ............................................................................. vii
Changes for Release 70, Guide Version 2.0 ............................................................................. ix
Table of Contents ....................................................................... xi
Product Overview ....................................................................... 1
VoIP Principle ..........................................................................................................................................1
SIP Components.....................................................................................................................................2
SIP IP Phone Models...............................................................................................................................3
Physical Features of SIP-T2xP IP Phones ......................................................................................4
Key Features of SIP-T2xP IP Phones ..............................................................................................8
Getting Started .......................................................................... 11
Connecting the IP Phones .................................................................................................................11
Initialization Process Overview...........................................................................................................14
Verifying Startup...................................................................................................................................15
Configuration Methods.......................................................................................................................16
Phone User Interface ...................................................................................................................16
Web User Interface ......................................................................................................................16
Configuration Files........................................................................................................................16
Reading Icons.......................................................................................................................................18
Configuring Basic Network Parameters ...........................................................................................19
DHCP ..............................................................................................................................................19
Configuring Network Parameters Manually ............................................................................22
PPPoE..............................................................................................................................................24
Configuring Transmission Methods of the Internet Port and PC Port ..................................26
Configuring PC Port Mode .........................................................................................................29

Administrator’s Guide for SIP-T2xP IP Phones
xii
Creating Dial Plan................................................................................................................................31
Replace Rule.................................................................................................................................32
Dial-now .........................................................................................................................................33
Area Code.....................................................................................................................................35
Block Out........................................................................................................................................36
Configuring Basic Features ...................................................... 38
Contrast .................................................................................................................................................39
Backlight................................................................................................................................................40
User Password .......................................................................................................................................42
Administrator Password.......................................................................................................................43
Phone Lock ...........................................................................................................................................45
Time and Date......................................................................................................................................47
Language..............................................................................................................................................52
Loading Language Packs...........................................................................................................52
Specifying the Language to Use ...............................................................................................53
Logo Customization.............................................................................................................................55
Softkey Layout ......................................................................................................................................57
Key as Send...........................................................................................................................................60
Hotline ....................................................................................................................................................62
Call Log..................................................................................................................................................64
Missed Call Log.....................................................................................................................................65
Local Directory .....................................................................................................................................66
Live Dialpad..........................................................................................................................................69
Call Waiting...........................................................................................................................................69
Auto Redial ...........................................................................................................................................72
Auto Answer..........................................................................................................................................73
Call Completion...................................................................................................................................74
Anonymous Call...................................................................................................................................76
Anonymous Call Rejection.................................................................................................................77
Do Not Disturb ......................................................................................................................................79
Busy Tone Delay ...................................................................................................................................85
Return Code When Refuse.................................................................................................................86
Early Media ...........................................................................................................................................87
180 Ring Workaround ..........................................................................................................................87
Use Outbound Proxy in Dialog...........................................................................................................89
SIP Session Timer ...................................................................................................................................90
Session Timer .........................................................................................................................................91
Call Hold ................................................................................................................................................93
Call Forward..........................................................................................................................................95
Call Transfer.........................................................................................................................................100
Network Conference ........................................................................................................................101
Transfer on Conference Hang Up...................................................................................................102
Directed Call Pickup .........................................................................................................................103

Table of
Contents
xiii
Group Call Pickup..............................................................................................................................106
Dialog-Info Call Pickup .....................................................................................................................110
Call Return...........................................................................................................................................112
Call Park...............................................................................................................................................113
Web Server Type ................................................................................................................................114
Calling Line Identification Presentation .........................................................................................116
Connected Line Identification Presentation.................................................................................117
DTMF.....................................................................................................................................................118
Suppress DTMF Display ......................................................................................................................121
Transfer via DTMF................................................................................................................................122
Intercom ..............................................................................................................................................123
Outgoing Intercom Calls...........................................................................................................123
Incoming Intercom Calls ...........................................................................................................124
Configuring Advanced Features ........................................... 127
Distinctive Ring Tones ........................................................................................................................127
Tones ....................................................................................................................................................131
Remote Phone Book .........................................................................................................................133
LDAP .....................................................................................................................................................135
Busy Lamp Field..................................................................................................................................138
Music on Hold.....................................................................................................................................142
Automatic Call Distribution ..............................................................................................................143
Message Waiting Indicator ..............................................................................................................145
Multicast Paging ................................................................................................................................147
Sending RTP Stream ...................................................................................................................147
Receiving RTP Stream ................................................................................................................149
Call Recording....................................................................................................................................151
Hot Desking .........................................................................................................................................155
Action URL ...........................................................................................................................................156
Action URI ............................................................................................................................................160
Server Redundancy...........................................................................................................................163
SIP Server Domain Name Resolution.......................................................................................166
LLDP ......................................................................................................................................................169
VLAN.....................................................................................................................................................172
VPN.......................................................................................................................................................175
Quality of Service...............................................................................................................................177
Network Address Translation............................................................................................................180
SNMP ....................................................................................................................................................181
802.1X Authentication.......................................................................................................................183
TR-069 Device Management...........................................................................................................189
IPv6 Support ........................................................................................................................................191
Configuring Audio Features ................................................... 195

Administrator’s Guide for SIP-T2xP IP Phones
xiv
Headset Prior.......................................................................................................................................195
Dual Headset......................................................................................................................................196
Audio Codecs ....................................................................................................................................197
Acoustic Clarity Technology............................................................................................................201
Acoustic Echo Cancellation ....................................................................................................201
Voice Activity Detection...........................................................................................................202
Comfort Noise Generation .......................................................................................................203
Jitter Buffer...................................................................................................................................204
Configuring Security Features................................................ 207
Transport Layer Security ....................................................................................................................207
Secure Real-Time Transport Protocol..............................................................................................213
Encrypting Configuration Files .........................................................................................................215
Upgrading Firmware ............................................................... 219
Resource Files.......................................................................... 223
Replace Rule Template ....................................................................................................................223
Dial-now Template ............................................................................................................................224
Softkey Layout Template ..................................................................................................................225
Local Contact File .............................................................................................................................227
Remote XML Phone Book.................................................................................................................228
Specifying the Access URL of Resource Files ................................................................................229
Troubleshooting....................................................................... 231
Troubleshooting Methods.................................................................................................................231
Viewing Log Files.........................................................................................................................231
Capturing Packets .....................................................................................................................234
Enabling Watch Dog Feature ..................................................................................................235
Getting Information from Status Indicators............................................................................236
Analyzing Configuration File.....................................................................................................236
Troubleshooting Solutions .................................................................................................................237
Why is the LCD screen blank?..................................................................................................237
Why doesn’t the IP phone get an IP address? .....................................................................237
Why does the IP phone display “No Service”?.....................................................................238
How do I find the basic information of the IP phone?.........................................................238
Why doesn’t the IP phone upgrade firmware successfully? ..............................................238
Why doesn’t the IP phone display time and date correctly?............................................238
Why do I get poor sound quality during a call? ...................................................................238
What is the difference between a remote phone book and a local phone book?.....239
What is the difference among user name, register name and display name? .............239
How to reboot the IP phone remotely? .................................................................................239

Table of
Contents
xv
Why does the IP phone use DOB format logo file instead of popular BMP, JPG and so on?
.......................................................................................................................................................240
How to increase or decrease the volume?...........................................................................240
What will happen if I connect both PoE cable and power adapter? Which has the
higher priority? ............................................................................................................................240
What is auto provisioning?........................................................................................................240
What is PnP? ................................................................................................................................240
Why doesn’t the IP phone update the configuration?.......................................................241
What do “on code” and “off code” mean?........................................................................241
How to solve the IP conflict problem?....................................................................................241
How to reset the IP phone to factory configurations? ........................................................241
How to restore the administrator password? ........................................................................242
What are the main differences among T28P, T26P, T22P and T20P? ................................242
Appendix ................................................................................. 245
Appendix A: Glossary........................................................................................................................245
Appendix B: Time Zones....................................................................................................................247
Appendix C: Configuration Parameters ........................................................................................250
Setting Parameters in Configuration Files...............................................................................250
Basic and Advanced Parameters...........................................................................................250
Audio Feature Parameters .......................................................................................................356
Security Feature Parameters ....................................................................................................363
Upgrading Firmware ..................................................................................................................368
Resource Files..............................................................................................................................370
Troubleshooting ..........................................................................................................................374
Configuring DSS Key...................................................................................................................376
Appendix D: SIP (Session Initiation Protocol) .................................................................................393
RFC and Internet Draft Support ...............................................................................................394
SIP Request ..................................................................................................................................395
SIP Header ...................................................................................................................................396
SIP Responses ..............................................................................................................................397
SIP Session Description Protocol (SDP) Usage........................................................................399
Appendix E: SIP Call Flows ................................................................................................................400
Successful Call Setup and Disconnect...................................................................................401
Unsuccessful Call Setup—Called User is Busy........................................................................403
Unsuccessful Call Setup—Called User Does Not Answer ....................................................407
Successful Call Setup and Call Hold.......................................................................................410
Successful Call Setup and Call Waiting .................................................................................412
Call Transfer without Consultation...........................................................................................417
Call Transfer with Consultation.................................................................................................421
Always Call Forward ..................................................................................................................427
Busy Call Forward .......................................................................................................................430
No Answer Call Forward............................................................................................................433
Call Conference.........................................................................................................................436

Administrator’s Guide for SIP-T2xP IP Phones
xvi
Appendix F: Sample Configuration File .........................................................................................441
Index ........................................................................................ 447

Product Overview
1
Product Overview
This chapter contains the following information about SIP-T2xP IP phones:
VoIP Principle
SIP Components
SIP IP 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 implement.
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 worldwide 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

Administrator’s Guide for SIP-T2xP IP Phones
2
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.
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 did not answer in the allotted number of rings. It
then returns a message indicating why the target endpoint was 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
changing 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 this 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

Product Overview
3
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. Using this
method may be the preferred measure when not using an application layer firewall,
application layer firewalls like to know what applications are flowing though which
ports and it is possible using content types of other applications other than the one you
are trying to let through which has been denied.
User agent server (UAS)
UAS is the server that hosts the application responsible for receiving SIP requests from a
UAC, and on reception 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.
SIP IP Phone Models
This section introduces the SIP-T2xP IP phone family. SIP-T2xP 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. SIP-T2xP 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-T2xP 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 history
and directory access. SIP-T2xP IP phones also support advanced functionalities,
including LDAP, Busy Lamp Field, Sever Redundancy and Network Conference.
The following IP phone models are described:
SIP-T28P
SIP-T26P
SIP-T22P
SIP-T20P
SIP-T2xP IP phones comply with the SIP standard (RFC 3261), and they can only be used
within a network that supports this type of phone.
For successfully operating as SIP endpoints in your network, SIP-T2xP IP phones must
meet the following requirements:

Administrator’s Guide for SIP-T2xP IP Phones
4
A working IP network is established.
Routers are configured for VoIP.
VoIP gateways are configured for SIP.
The latest (or compatible) firmware of SIP-T2xP IP phones is available.
A call server is active and configured to receive and send SIP messages.
Physical Features of SIP-T2xP IP Phones
This section lists the available physical features of SIP-T2xP IP phones.
SIP-T28P
Physical Features:
-TI TITAN chipset and TI voice engine
-320x160 graphic LCD with 4-level grayscales
-6 VoIP accounts, BroadSoft/Avaya/Asterisk validated
-HD Voice: HD Codec, HD Handset, HD Speaker
-48 keys including 16 DSS keys
-1xRJ9 (4P4C) handset port
-1xRJ9 (4P4C) headset port
-2xRJ45 10/100M Ethernet ports
-1XRJ12 (6P6C) expansion module port
-19 LEDs: 1xpower, 6xline, 1xmessage, 1xheadset, 10xmemory
-Power adapter: AC 100~240V input and DC 5V/1.2A output
-Power over Ethernet (IEEE 802.3af)