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SIP-T4U Series
Yealink SIP-T4U Series
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2
Table of Contents
Main Page
Before You Begin
2
Related Documentations
2
Recommended References
2
Summary of Changes
2
Changes for Release V85, Guide Version V85.1
3
Table of Contents
4
Getting Started
23
Requirements
23
Yealink IP Phones in a Network
23
Initialization Process Overview
24
Loading the ROM File
24
Configuring the VLAN
25
Querying the DHCP (Dynamic Host Configuration Protocol) Server
25
Contacting the Provisioning Server
25
Updating Firmware
25
Downloading the Resource Files
25
Verifying Startup
25
Network Configurations
26
Ipv4 and Ipv6 Wired Network Settings
26
Wired Network IP Addressing Mode Configuration
26
Ipv4 Wired Network Configuration
27
Ipv6 Wired Network Configuration
30
DHCP Option for Ipv4
34
Supported DHCP Option for Ipv4
34
DHCP Option 66, Option 43 and Custom Option
34
DHCP Option 42, Option 2 and Option 100
35
DHCP Option 12
35
DHCP Option 12 Hostname Configuration
35
DHCP Option 120
36
DHCP Option 120 Configuration
36
DHCP Option 60 Configuration
37
DHCP Option for Ipv6
37
Supported DHCP Option for Ipv6
37
DHCP Option 59 and Custom Option
37
Vlan
38
LLDP Configuration
38
CDP Configuration
39
Manual VLAN Configuration
40
DHCP VLAN Configuration
42
VLAN Change Configuration
42
Wi-Fi
43
Wi-Fi Configuration
43
Wireless Network IP Addressing Mode Configuration
48
Ipv4 Wireless Network Configuration
48
Ipv6 Wireless Network Configuration
52
Real-Time Transport Protocol (RTP) Ports
55
RTP Ports Configuration
56
Network Address Translation (NAT)
56
NAT Traversal Configuration
56
Keep Alive Configuration
59
Rport Configuration
60
SIP Port and TLS Port Configuration
60
Internet Port and PC Port
61
Supported Transmission Methods
61
Internet Port and PC Port Configuration
61
Vpn
63
Openvpn Related Files
63
VPN Configuration
64
Example: Using VPN Based on L2TP Prototol
65
Exporting the Openvpn Configuration File from the Phone
66
Importing the Openvpn Configuration File to Phone
66
Quality of Service (Qos)
66
Voice and SIP Qos Configuration
66
802.1X Authentication
67
802.1X Authentication Configuration
67
TR-069 Device Management
70
Supported RPC Methods
70
TR-069 Configuration
70
Phone Provisioning
73
Boot Files, Configuration Files, and Resource Files
73
Boot Files
73
Common Boot File
73
Boot File Attributes
74
MAC-Oriented Boot File
74
Customizing a Boot File
75
Configuration Files
75
Common CFG File
76
MAC-Oriented CFG File
76
Configuration File Attributes
77
Configuration File Customization
77
Customizing a Configuration File
77
MAC-Local CFG File
77
Resource Files
78
Supported Resource Files
78
Files Download Process
79
Provisioning Methods
80
Provisioning Methods Priority
81
Web User Interface
81
Accessing the Web User Interface
81
Quick Login Configuration
82
Web Server Type Configuration
83
Navigating the Web User Interface
84
Phone User Interface
85
Central Provisioning
85
Auto Provisioning Settings Configuration
86
User-Triggered Provisioning Settings Configuration
92
PIN Code Provisioning Settings Configuration
93
Viewing Configurations Configured Via Different Provisioning Methods
93
Setting up a Provisioning Server
94
Supported Provisioning Protocols
94
Provisioning Protocols Configuration
94
Supported Provisioning Server Discovery Methods
95
Zero Touch Provision Configuration
95
DHCP Provision Configuration
96
Pnp Provision Configuration
96
Static Provision Configuration
98
Configuring a Provisioning Server
99
Keeping User's Personalized Settings after Auto Provisioning
99
Keeping User's Personalized Settings Configuration
99
Auto Provisioning Flowchart for Keep User's Personalized Configuration Settings
100
Example: Keeping User's Personalized Settings
101
Clearing User's Personalized Configuration Settings
102
Example: Deploying Phones from the Provisioning Server
102
Security Features
105
User and Administrator Identification
105
User and Administrator Identification Configuration
105
User Access Level Configuration
106
Auto Logout Time
107
Auto Logout Time Configuration
107
Phone Lock
107
Operation Behaviors on Lock Phone
108
Phone Lock Configuration
108
Transport Layer Security (TLS)
110
Supported Cipher Suites
110
Supported Trusted and Server Certificates
111
Supported Trusted Certificates
112
TLS Configuration
114
Secure Real-Time Transport Protocol (SRTP)
116
SRTP Configuration
117
Encrypting and Decrypting Files
119
Configuration Files Encryption Tools
119
Configuration Files Encryption and Decryption
119
Contact Files Encryption and Decryption
119
Encryption and Decryption Configuration
120
Incoming Network Signaling Validation
123
Incoming Network Signaling Validation Configuration
123
USB Port Lock
124
USB Port Lock Configuration
124
Firmware Upgrade
126
Firmware for each Phone Model Firmware Upgrade Configuration
126
Using Handsets with T57W/T54W/T53W/T53 Phones
128
Handset Backlight
128
Handset Backlight Configuration
128
Handset Keypad Light
129
Handset Keypad Light Configuration
129
Handset Wallpaper
130
Handset Wallpaper Configuration
130
Handset Screen Saver
130
Handset Screen Saver Configuration
130
Handset Name
131
Handset Name Configuration
131
Number Assignment
131
Number Assignment Configuration
132
End Call on Hook
133
End Call on Hook Configuration
133
Advisory Tones
133
Advisory Tones Configuration
134
Base PIN
135
Base PIN Configuration
135
DECT Intercom
136
DECT Intercom Configuration
136
Shared Directory
137
Shared Directory Configuration
137
Shared Contact File Customization
137
Customizing Shared Contact File
138
Shared Contact File Elements and Attributes
138
Satellite Mode
138
Satellite Mode Configuration
139
Example: Configuring the Satellite Mode Feature
140
Repeater Settings Parameters
141
Handset Settings Parameters
142
Custom Handset Related Configurations
146
Handset Firmware Upgrade Configuration
147
Audio Features
149
Alert Tone
149
Alert Tone Configuration
149
Touch Tone
151
Touch Tone Configuration
151
Ring Tones
151
Custom Ringtone Limit
151
Ringtone Configuration
152
Distinctive Ring Tones
154
Supported Alert-Info Headers Format
154
Alert-Info: Bellcore-Drn
154
Alert-Info: Ringtone-N/Alert-Info: Ringtone-Ringn.wav
154
Mymelodyringn.wav)
155
Alert-Info: <URL
156
Alert-Info: Info=Info Text;X-Line-ID=0
157
Distinctive Ring Tones Configuration
157
Ringer Device
158
Ringer Device Configuration
159
Audio Volume
159
Ringer Volume Configuration
159
Sending Volume Configuration
160
Tones
162
Supported Tones
162
Tones Configuration
163
Audio Codecs
168
Supported Audio Codecs
168
Audio Codecs Configuration
170
Packetization Time (Ptime)
173
Supported Ptime of Audio Codec
173
Ptime Configuration
174
Early Media
174
Early Media Configuration
174
Headset Prior
175
Headset Prior Configuration
175
Dual Headset
176
Dual Headset Configuration
176
Acoustic Clarity Technology
176
Acoustic Echo Cancellation (AEC)
177
AEC Configuration
177
Noise Suppression
177
Noise Suppression Configuration
177
Background Noise Suppression (BNS)
178
Automatic Gain Control (AGC)
178
Voice Activity Detection (VAD)
178
VAD Configuration
178
Comfort Noise Generation (CNG)
178
CNG Configuration
178
Jitter Buffer
179
Jitter Buffer Configuration
179
Smart Noise Block
180
Smart Noise Block Configuration
181
Acoustic Shield
181
Acoustic Shield Configuration
181
Smart Noise Filtering
182
Smart Noise Filtering Configuration
182
Dtmf
182
DTMF Keypad
182
Transmitting DTMF Digit
183
Transmitting DTMF Digit Configuration
183
Suppress DTMF Display
185
Suppress DTMF Display Configuration
185
Transfer Via DTMF
185
Transfer Via DTMF Configuration
185
Local DTMF Tone
186
Local DTMF Tone Configuration
186
Voice Quality Monitoring (VQM)
186
Rtcp-Xr
186
RTCP-XR Configuration
187
Vq-Rtcpxr
187
Voice Quality Reports
187
Voice Quality Reports Configuration
188
VQ-RTCPXR Display
189
VQ-RTCPXR Display Configuration
190
Central Report Collector
192
Central Report Collector Configuration
193
Phone Customization
194
Language
194
Supported Languages
194
Language Display Configuration
195
Language for Phone Display Customization
196
Customizing a Language Pack for Phone Display
196
Custom Language for Phone Display Configuration
197
Example: Setting a Custom Language for Phone Display
197
Language for Web Display Customization
198
Customizing a Language Pack for Web Display
198
Custom Language for Web and Note Display Configuration
199
Customizing a Language Pack for Note Display
199
Contrast
200
Contrast Configuration
200
Wallpaper
201
Wallpaper Configuration
201
Wallpaper Customization
202
Custom Wallpaper Configuration
203
Custom Wallpaper Picture Limit
203
Deleting a Custom Picture
203
Adding a Wallpaper from a USB Flash Drive
203
Example: Setting a Custom Picture as Wallpaper
204
Transparency
204
Transparency Configuration
204
Screen Saver
205
Screensaver Display Customization
205
Customizing the Screen Saver File
206
Screensaver File Elements and Attributes
206
Custom Screensaver Picture Limit
207
Screensaver Configuration
207
Adding a Screensaver Picture from a USB Flash Drive
210
Deleting a Screensaver Picture
210
Backlight
210
Supported Backlight Options
211
Backlight and Time Configuration
211
Label Length for Line Key Display
212
Label Length Display Configuration
213
Label Alignment for Line/Ext Key Display
214
Label Alignment Display Configuration
214
Page Switch Key
215
Page Switch Key Configuration
215
Page Tips
215
Phone Page Tips
215
Phone Page Tips Indicator
215
Phone Page Tips Configuration
216
Expansion Module Page Tips
216
Expansion Module Page Tips Configuration
217
Expansion Module Page Tips Indicator
217
Time and Date
217
Time Zone
218
NTP Settings
221
NTP Configuration
221
DST Settings
223
Auto DST File Attributes
223
Customizing Auto DST File
224
DST Configuration
225
Time and Date Manually Configuration
226
Time and Date Format Configuration
227
Date Customization Rule
228
Idle Clock Display
229
Idle Clock Display Configuration
229
Logo Customization
229
Custom Logo Picture Limit
230
Customizing a Logo Picture
230
Custom Logo Configuration
231
Example: Setting a Custom Logo Display
232
Call Display
232
Call Display Configuration
233
Display Method on Dialing
235
Display Method on Dialing Configuration
236
Key as Send
236
Key as Send Configuration
236
Softkey Layout
237
Softkey Layout File Customization
237
Customizing Softkey Layout File
238
Softkey Layout File Elements and Attributes
238
Softkey Layout Configuration
239
Example: Setting the Soft Keys Layout in Talking State
241
Input Method
241
Keypad Input Method File Customization
241
Customizing the Keypad Input Method File
242
Onscreen Keyboard Input Method File Customization
242
Customizing a Lang File
243
Description of the Onscreen Keyboard Input Method Files
243
Lang File Elements and Attributes
243
Ime File Elements and Attributes
244
Customizing an Ime File
245
Layout File Elements and Attributes
245
Customizing a Layout File
246
Input Method Configuration
246
Example: Configuring the French Onscreen Keyboard Input Method
248
Notification Popups
249
Notification Popups Configuration
249
Power LED Indicator
250
Power LED Indicator Configuration
250
Bluetooth
253
Bluetooth Configuration
253
Handset/Headset/Speakerphone Mode
255
Handset/Headset/Speakerphone Mode Configuration
255
DSS Keys
256
Supported DSS Keys
257
Supported Dsskey Types
257
Line Keys
258
Line Keys Configuration
258
Example: Set a Park/Retrieve Key for FAC Call Park Mode
262
Example: Set a Park/Retrieve Key for Transfer Call Park Mode
262
Example: Setting a Line Key as Directed Pickup Key
263
Example: Setting a Line Key as Group Pickup Key
263
Example: Setting a Line Key as Forward Key
264
Example: Setting a Line Key as BLF List Key
265
Example: Setting a Line Key as Multicast Paging Key
265
Example: Setting a Line Key as Private Hold Key
265
Programmable Keys
265
Supported Programmable Keys
265
Programmable Keys Configuration
266
Ext Keys
269
Ext Keys Configuration
269
Dsskey Lock Configuration
272
Dsskey Page Reset Configuration
273
Enhanced DSS Keys
273
Guidelines for Configuring Enhanced DSS Keys
274
Macro Action Strings
274
EDK Configuration
278
EDK List Configuration
278
EDK User Input Prompt Configuration
279
EDK Soft Keys Configuration
281
Example: Configuring EDK List for a Line Key
284
Example: Using EDK Macro Strings as the Contact Number
285
Power Saving
285
Power Saving Configuration
286
Search Source List in Dialing
288
Search Source File Customization
288
Search Source File Attributes
289
Customizing Search Source File
290
Search Source List Configuration
290
Recent Call Display in Dialing
292
Recent Call in Dialing Configuration
292
Icon Customization
292
Custom Icons Configuration
292
Warnings Display
293
Warnings Display Configuration
293
Out of Service
293
Out of Service Configuration
293
Account Settings
295
Account Registration
295
Supported Accounts
295
SIP Accounts Registration Configuration
295
PSTN Account Configuration
299
Registration Settings Configuration
300
Outbound Proxy in Dialog
302
Outbound Proxy in Dialog Configuration
302
Server Redundancy
303
Behaviors When Working Server Connection Fails
304
Registration Method of the Failover/Fallback Mode
304
Fallback Server Redundancy Configuration
304
Failover Server Redundancy Configuration
305
SIP Server Name Resolution
309
SIP Server Name Resolution Configuration
309
Static DNS Cache
310
Behave with a Configured DNS Server
310
Static DNS Cache Configuration
311
Logon Wizard
314
Logon Wizard Configuration
314
Multiple Line Keys Per Account
316
Multiple Line Keys Per Account Configuration
316
Auto Line Labels Rule Configuration
318
Default Account
318
Directory
320
Local Directory
320
Contact Avatars and Icons Picture Limit
320
Preparing the Tar Formatted File
320
Local Contact File Customization
322
Local Contact File Elements and Attributes
322
XML Conversion Table
322
Customizing Local Contact File
324
Local Contact Files and Resource Upload
324
Example: Adding Contacts Using a Contact File
326
Local Contacts Backup
327
Favorite Contacts
328
Favorites Configuration
328
Google Contacts
329
Google Contacts Configuration
329
Signing in to the Google Contact Server
330
Lightweight Directory Access Protocol (LDAP)
330
LDAP Attributes
330
Securely Storing the LDAP Credentials
331
LDAP Configuration
331
Remote Phone Book
338
Remote Phone Book File Customization
338
Remote Phone Book File Elements
338
Customizing Remote Phone Book File
339
Remote Phone Book Configuration
339
Example: Configuring a Remote Phone Book
341
Directory List for Directory/Dir Soft Key
341
Directory List File Customization
341
Directory List File Attributes
342
Customizing Directory List File
343
Directory List Configuration
343
Example: Configuring a Directory List
345
Directory Search Settings
345
Directory Search Settings Configuration
345
Number Matching Settings
346
Number Matching Settings Configuration
346
Example: Matching Contacts with the Caller's Phone Number Using the Regular Expression
347
Call Log
348
Call Log Display Call Log Configuration Call Logs Backup
348
Call Features
353
Dial Plan Defined by Four Patterns (Old Dial Plan Mechanism)
353
Basic Regular Expression Syntax for Four Patterns
354
Replace Rule File Customization
354
Replace Rule File Attributes
354
Customizing the Replace Rule File
355
Dial Now File Customization
355
Dial Now File Attributes
355
Customizing the Dial Now File
356
Replace Rule Configuration
356
Dial Now Configuration
357
Area Code Configuration
358
Block out Configuration
359
Example: Adding Replace Rules Using a Replace Rule File
360
Dial Plan Defined by Digit Map (New Dial Plan Mechanism)
361
Basic Regular Expression Syntax for Digit Map
361
Digit Map for All Lines Configuration
362
Digit Map for a Specific Line Configuration
365
Emergency Dialplan and Enhanced 911
368
Emergency Dialplan and Enhanced 911 Configuration
369
Hotline Configuration
373
Off Hook Hot Line Dialing
374
Off Hook Hot Line Dialing Configuration
374
Live Dialpad
375
Live Dialpad Configuration
375
Auto Redial
375
Auto Redial Configuration
375
Recall Configuration
377
Speed Dial
377
Speed Dial Key Configuration
377
Password Dial
378
Password Dial Configuration
378
Call Timeout
378
Call Timeout Configuration
379
Anonymous Call
379
Anonymous Call Configuration
379
Call Number Filter
380
Call Number Filter Configuration
380
IP Address Call
381
IP Address Call Configuration
381
Ignoring Incoming Calls
381
Ignoring Incoming Calls Configuration
382
Off Hook Answering
382
Off Hook Answering Configuration
382
Auto Answer
383
Auto Answer Configuration
383
Anonymous Call Rejection
386
Anonymous Call Rejection Configuration
386
Call Waiting
387
Call Waiting Configuration
387
Do Not Disturb (DND)
388
DND Settings Configuration
389
DND Feature Configuration
391
DND in Phone Mode Configuration
391
DND in Custom Mode Configuration
392
DND Synchronization for Server-Side Configuration
393
Multiple Call Appearances
394
Multiple Call Appearances Configuration
394
Call Hold
395
Call Hold Configuration
396
Music on Hold (Moh) Configuration
398
Call Mute
398
Microphone Mute Configuration
398
Keep Mute
399
Keep Mute Configuration
399
Mute Alert Tone
399
Mute Alert Tone Configuration
399
Call Forward
400
Call Forward Settings Configuration
400
Call Forward Feature Configuration
402
Call Forward in Phone Mode Configuration
402
Call Forward in Custom Mode Configuration
406
Call Forward Synchronization for Server-Side Configuration
410
Call Transfer
412
Call Transfer Configuration
412
Transfer Mode for Dsskey Configuration
413
Conference
414
Conference Type Configuration
414
Local Conference Configuration
414
Network Conference Configuration
415
USB Recording
416
USB Recording Configuration
416
Multicast Paging
417
Multicast Paging Group Configuration
418
Multicast Listening Group Configuration
419
Multicast Paging Settings
419
Multicast Paging Settings Configuration
420
Advanced Features
423
Call Pickup
423
Directed Call Pickup
423
Directed Call Pickup Configuration
423
Group Call Pickup
425
Group Call Pickup Configuration
425
Dialog Info Call Pickup
426
Dialog Info Call Pickup Configuration
427
Call Completion
427
Call Completion Configuration
430
Example: Using Call Completion
430
Call Park and Retrieve
430
Call Park and Retrieve Configuration
430
Example: Setting Call Park and Retrieve in FAC Mode
432
Example: Setting Call Park and Retrieve in Transfer Mode
432
Automatic Call Distribution (ACD)
433
ACD Key Configuration
433
ACD Configuration
433
Example: Setting ACD
435
Busy Lamp Field
435
BLF Key Configuration
436
BLF List Configuration
436
State Indicator of Remote Line
438
BLF/BLF List Subscription
439
BLF/BLF List Subscription Configuration
440
Visual and Audio Alert for Monitor Lines
442
Visual and Audio Alert for BLF Lines Configuration
442
Example: Configuring Visual and Audio Alert for Monitor Lines
444
LED Mode for BLF/BLF List Key
445
Supported BLF LED Modes
445
BLF LED Mode Configuration
447
BLF/BLF List Key LED Status and Behavior Configuration
447
Supported BLF/BLF List Key Behaviors
447
BLF Key Led/Icon and Behavior for Idle State Configuration
448
BLF Key Led/Icon and Behavior for Call-In State Configuration
449
BLF Key Led/Icon and Behavior for Call-Out State Configuration
450
BLF Key Led/Icon and Behavior for Talking State Configuration
451
BLF Key Led/Icon and Behavior for Parked-Against State Configuration
453
BLF Key Led/Icon and Behavior for Hold State Configuration
454
BLF Key Led/Icon and Behavior for DND State Configuration
455
BLF Key for Intercom Configuration
455
Call Information Display Configuration
456
Shared Line
456
State Indicator of Shared Line
456
Shared Call Appearance (SCA) Configuration
457
SCA Configuration
458
Bridge Lines Appearance (BLA)
459
BLA Configuration
459
Intercom
460
Intercom Key Configuration
461
State Monitor for Intercom Contact
461
State Indicator of Intercom Contact
461
State Monitor for Intercom Contact Configuration
462
Outgoing Intercom Configuration
462
Incoming Intercom Configuration
463
CSTA Control
464
CSTA Control Configuration
465
Action URL
465
Predefined Events List
465
Variable Values List
467
Action URL Configuration
469
Action URI
479
Supported HTTP/HTTPS GET Request
479
Supported SIP Notify Message
479
Variable Values List
480
Action URI Configuration
483
Example: Capturing the Current Screen of the Phone
484
Example: Placing a Call Via Web User Interface
485
Voice Mail
486
MWI for Voice Mail Configuration
486
Short Message Service (SMS)
488
SMS Configuration
488
XML Browser
488
XML Browser Configuration
488
Hot Desking
490
Hot Desking Key Configuration
491
Hot Desking Configuration
491
General Features
493
Line Identification Presentation
493
CLIP and COLP Configuration
493
Return Code for Refused Call
495
Return Code for Refused Call Configuration
495
Return Code for Unanswered Call
495
Return Code for Unanswered Call Configuration
495
Hide Feature Access Codes
496
Hide Feature Access Codes Configuration
496
Accept SIP Trust Server Only
497
Accept SIP Trust Server Only Configuration
497
100 Reliable Retransmission
497
100 Reliable Retransmission Configuration
498
SIP Session Timer
498
SIP Session Timer Configuration
498
Session Timer
499
Session Timer Configuration
500
Reboot in Talking
500
Reboot in Talking Configuration
501
Reserve # in User Name
501
Reserve # in User Name Configuration
501
Busy Tone Delay
502
Busy Tone Delay Configuration
502
CFG File Version Information
502
CFG File Version Information Configuration
502
Media Loopback
503
Media Loopback Configuration
503
Cloud
504
Cloud Configuration
505
Configuration Parameters
506
Broadsoft Parameters
506
Broadsoft Settings
506
Broadsoft UC
507
Broadsoft XSI
510
Broadsoft ACD
512
Broadsoft Centralized Call Recording
516
Broadsoft Security Classification
516
Broadsoft Hoteling
516
Broadsoft Flexible Seating
518
Broadsoft Call Decline
519
Broadsoft Network Directory
519
Broadsoft Visual Voice Mail
524
Broadsoft SCA
524
Broadsoft Call Park
525
Broadsoft Emergency Call
527
Broadsoft Call Waiting Sync
527
Start2Start ACD Parameters
527
Alcatel-Lucent Barge in Parameters
529
Ethernet Interface MTU Parameters
530
SIP Settings Parameters
530
Call Settings Parameters
534
Unify Parameters
536
Troubleshooting Methods
537
Exporting All the Diagnostic Files
537
Log Files
537
Local Logging
537
Local Logging Configuration
538
Exporting the Log Files to a Local PC
540
Uploading Log to the USB Flash Drive
541
Viewing the Log Files
541
Syslog Logging
542
Syslog Logging Configuration
542
Viewing the Syslog Messages on Your Syslog Server
545
Resetting Phone and Configuration
545
Reset to Factory Configuration
545
Resetting the IP Phone to Default Factory Settings
546
Resetting the IP Phone to Custom Factory Settings
546
Custom Factory Configuration
546
Deleting the Custom Factory Settings Files
547
Resetting a Configuration to Default Factory Setting
547
Packets Capture
547
Capturing the Packets Via Web User Interface
548
Capturing the Packets in Enhanced Way
548
Capturing the Packets in Normal Way
548
Ethernet Software Capturing Configuration
549
Span to PC Port Configuration
549
Watch Dog
549
Watch Dog Configuration
550
Network Diagnostics
550
Ping and Traceroute Diagnostics
550
Network Reachability Detection Configuration
551
Analyzing Configuration Files
552
Exporting CFG Configuration Files from Phone
552
Importing CFG Configuration Files to Phone
553
Configuration Files Import URL Configuration
553
Exporting bin Files from the Phone
553
Importing bin Files from the Phone
553
BIN Files Import URL Configuration
553
Device Status
554
Viewing Device Status
554
Phone Reboot
554
Rebooting the IP Phone Remotely
554
Notify Reboot Configuration
555
Rebooting the Device Via the Phone User Interface
555
Rebooting the Device Via Web User Interface
555
Troubleshooting Solutions
556
IP Address Issues
556
The Device Does Not Get an IP Address
556
Solving the IP Conflict Problem
556
The Specific Format in Configuring Ipv6 on Yealink Phones
556
Time and Date Issues
557
Display Time and Date Incorrectly
557
Display Issues
557
The Phone Screen Is Blank
557
The Phone Displays "No Service
557
Phone Book Issues
557
Difference between a Remote Phone Book and a Local Phone Book
557
Audio Issues
557
Increasing or Decreasing the Volume
557
Get Poor Sound Quality During a Call
557
There Is no Sound When the Other Party Picks up the Call
558
Play the Local Ringback Tone Instead of Media When Placing a Long-Distance Number Without Plus
558
Wi-Fi and Bluetooth Issues
558
The Wireless Signal Strength Is Low
558
The Phone Cannot Connect to Bluetooth Devices All the Time
558
The Bluetooth Headset Affects IP Phone's Voice Quality
558
Firmware and Upgrading Issues
558
Fail to Upgrade the Phone Firmware
558
Verifying the Firmware Version
559
The IP Phone Does Not Update the Configurations
559
System Log Issues
560
Fail to Export the System Log to a Provisioning Server (FTP/TFTP Server)
560
Fail to Export the System Log to a Syslog Server
560
Protocols and Ports Issues
560
What Communication Protocols and Ports Do Yealink IP Phones Support
560
Password Issues
561
Restore the Administrator Password
561
The Web Screen Displays "Default Password Is in Use. Please Change
561
Logo Issues
562
Why Does the IP Phone Use DOB Format Logo File Instead of Popular BMP, JPG and so on
562
Power and Startup Issues
562
Both Poe Cable and Power Adapter Is Connected to the Phone
562
The Power LED Indicator Has no Lights
562
The Phone Screen Is Black
562
The IP Phone Always Displays the Yealink Logo
562
Other Issues
562
The Difference Among User Name, Register Name, and Display Name
562
On Code and off Code
562
The Difference between RFC 2543 Hold Enabled and Disabled
563
The Difference between Shared Call Appearance (SCA) and Bridge Lines Appearance (BLA)
563
Appendix
564
RFC and Internet Draft Support
564
Reading Icons
566
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Yealink SIP-T4U Series Specifications
General
Wall Mountable
Yes
Voice Codecs
G.722, G.711
Power over Ethernet
Yes
USB Ports
1
Protocols
SIP
HD Audio
Yes
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