Name: Yealink SIP-T21 E2
Brand: Yealink
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Troubleshooting 
1007 
For more information, refer to Shared Call Appearance (SCA) on page 653 and Bridge Lines 
Appearance (BLA) on page 663 . 
 

End User License Agreement3
Patent Information3
Technical Support3
Gnu Gpl Information4
About this Guide5
Voip Principle12
Sip Components13
Table of Contents18
Table of Contents19
Table of Contents20
Table of Contents21
Table of Contents22
Table of Contents23
Table of Contents24
Table of Contents25
Product Overview27
Key Features of IP Phones41
Expansion Modules43
Getting Started47
Connecting the IP Phones48
Connecting the Handset and Optional Headset (Not Applicable to CP860/CP920 IP Phones)57
Connecting the Power and Network59
Connecting the Optional Expansion Microphones (Only Applicable to CP860 IP Phones)64
Initialization Process Overview67
Verifying Startup68
Setting up Your System71
Dhcp72
DHCP Option76
Configuring Network Parameters Manually82
Configuring Transmission Methods of the Internet Port and PC Port87
Configuring PC Port Mode91
Web Server Type92
Wi-Fi96
Vlan102
Ipv6 Support114
Network Address Translation (NAT)126
Nat Traversal127
Quality of Service (Qos)144
Voice Qos145
X Authentication147
Setting up Your Phones with a Provisioning Server158
Provisioning Methods159
Phone User Interface161
Boot Files, Configuration Files and Resource Files162
Configuration Files164
Resource Files166
Setting up a Provisioning Server171
Supported Provisioning Protocols172
Deploying Phones from the Provisioning Server173
Upgrading Firmware174
Keeping User Personalized Settings after Auto Provisioning184
Configuring Basic Features195
Power Indicator LED197
Notification Popups203
Contrast206
Wallpaper208
Transparency215
Screen Saver217
Power Saving225
Backlight229
Idle Clock Display234
Bluetooth235
Page Switch Key on239
Enable Page Tips240
Page Tips for Expansion Module242
Label Length244
Linekey Length in Short247
Account Registration249
SIP Account251
PSTN Account259
Multiple Line Keys Per Account261
Multiple Call Appearances267
Call Display268
Display Method on Dialing273
Time and Date274
NTP Time Server276
Time and Date Settings281
Daylight Saving Time (DST)286
Language on293
Specifying the Language to Use301
Input Method303
Specifying the Default Input Method307
Logo Customization308
Customizing a Logo Template File309
Configuring the Logo Shown on the Idle Screen310
Softkey Layout313
Customizing Softkey Layout Template File315
Key as Send322
Dial Plan325
Dial Plan Using XML Template Files326
Replace Rule327
Dial Now331
Area Code336
Block out339
Dial Plan Using Digit Map String Rules341
Emergency Dialplan350
Hotline355
Off Hook Hot Line Dialing357
Off Hook Contact Dialing359
Directory List360
Customizing a Directory Template File361
Lightweight Directory Access Protocol (LDAP) on364
Call Log367
Backing up the Call Logs369
Call List Show Number371
Missed Call Log373
Local Directory376
Configuring Local Directory389
Backing up the Local Contacts393
Live Dialpad395
Speed Dial397
Speed Dial Key398
Call Waiting405
Auto Redial409
Auto Answer411
IP Direct Auto Answer419
Allow IP Call420
Accept SIP Trust Server Only421
Call Completion423
Anonymous Call426
Anonymous Call Rejection431
Do Not Disturb (DND)435
Busy Tone Delay452
Return Code When Refuse454
Early Media456
Use Outbound Proxy in Dialog457
SIP Session Timer459
Session Timer461
Call Hold465
Music on Hold (Moh)469
Call Forward471
Call Transfer495
Local Conference497
Network Conference499
Transfer on Conference Hang up502
Feature Key Synchronization503
Transfer Mode Via Dsskey505
Allow Trans Exist Call506
Directed Call Pickup508
Group Call Pickup520
Dialog Info Call Pickup532
Recent Call in Dialing535
Recall536
Call Number Filter542
Call Park544
Calling Line Identification Presentation (CLIP)558
Connected Line Identification Presentation (COLP)563
Mute566
Keep Mute568
Intercom569
Intercom Key571
Incoming Intercom Calls580
Call Timeout583
Ringing Timeout584
Send User=Phone585
SIP Send MAC587
SIP Send Line589
Reserve # in User Name591
Password Dial593
Unregister When Reboot595
Reliable Retransmission597
Reboot in Talking599
Answer by Hand600
USB Recording601
Idle Recording603
CSTA Control604
Quick Login606
Cloud607
Configuring Advanced Features609
Remote Phone Book610
Lightweight Directory Access Protocol (LDAP)617
Busy Lamp Field (BLF)633
Visual Alert and Audio Alert for BLF Pickup637
BLF LED Mode640
Configuring BLF LED Status and BLF Key Behavior643
Configuring a BLF Key655
Busy Lamp Field (BLF) List661
Hide Feature Access Codes669
Automatic Call Distribution (ACD)671
Shared Call Appearance (SCA)679
Bridge Lines Appearance (BLA)689
Message Waiting Indicator (MWI)693
Short Message Service (SMS)698
Multicast Paging700
Receiving RTP Stream718
Dsskey Recording (Record and URL Record)724
Url Record725
Hot Desking734
Logon Wizard742
Action URL746
Action URI765
Configuring Trusted IP Address for Action URI770
Scenario a - Capturing the Current Screen of the Phone773
Scenario B - Placing a Call Via Web User Interface774
Server Redundancy775
Phone Registration777
Server Domain Name Resolution789
Static DNS Cache793
Real-Time Transport Protocol (RTP) Ports801
TR-069 Device Management803
XML Browser809
Enhanced DSS Keys816
Understanding Macro Action Strings817
Configuring EDK Feature821
Configuring EDK List823
Configuring EDK Prompt825
Configuring EDK Soft Keys827
Configuring a Custom Key835
Example Macros843
Configuring Audio Features845
Ring Tones846
Touch Tone852
Distinctive Ring Tones853
Tones860
Voice Mail Tone868
Ringer Device for Headset870
Handset/Headset/Speakerphone Mode872
Headset Prior873
Dual Headset875
Sending Volume877
Ringer Volume879
Audio Codecs880
Audio Codecs on881
Packetization Time (Ptime)902
Acoustic Clarity Technology905
Background Noise Suppression (BNS)906
Automatic Gain Control (AGC)907
Comfort Noise Generation (CNG)908
Jitter Buffer on910
Noise Suppression914
Smart Noise Block915
Dtmf916
Methods of Transmitting DTMF Digit on917
Suppress DTMF Display923
Transfer Via DTMF924
DTMF Send Event Flash926
Play Local DTMF Tone928
Voice Quality Monitoring (VQM)929
Rtcp-Xr930
Vq-Rtcpxr931
Configuring Security Features949
Auto Logout Time951
Phone Lock952
Phone Lock Key957
Transport Layer Security (TLS)964
Secure Real-Time Transport Protocol (SRTP)975
Encrypting and Decrypting Files978
Encrypting and Decrypting Configuration Files982
Procedure to Encrypt Configuration Files984
Encrypting and Decrypting Contact Files985
Incoming Signaling Validation986
Troubleshooting989
Capturing Packets1004
Enabling Watch Dog Feature1007
Getting Information from Status Indicators1008
Analyzing Configuration Files1009
Exporting All the Diagnostic Files1012
Ping and Traceroute1013
Troubleshooting Solutions1015
Time and Date Issues1016
Phone Book Issues1017
Wi-Fi and Bluetooth Issues1018
Provisioning Issues1020
Resetting Issues1021
Rebooting Issues1024
Protocols and Ports Issues1027
Password Issues1030
Other Issues1031
Appendix1035
Appendix B: Time Zones1037
Appendix C: Trusted Certificates1038
Appendix D: Configuring DSS Keys1040
Appendix E: Auto Provisioning Flowchart (Keep User Personalized Configuration Settings)1062
Appendix F: Static Settings1063
Appendix G: Reading Icons1069
Appendix H: SIP (Session Initiation Protocol)1079
SIP Request1082
SIP Header1083
SIP Responses1084
SIP Session Description Protocol (SDP) Usage1087
Successful Call Setup and Disconnect1088
Unsuccessful Call Setup—Called User Is Busy1090
Unsuccessful Call Setup—Called User Does Not Answer1092
Successful Call Setup and Call Hold1094
Successful Call Setup and Call Waiting1097
Call Transfer Without Consultation1101
Call Transfer with Consultation1105
Always Call Forward1110
Busy Call Forward1112
No Answer Call Forward1115
Call Conference1118
Index1123

Yealink SIP-T21 E2 Administrator's Guide

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Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English