Yealink SIP-T27P [15/841] Troubleshooting 15

Yealink SIP-T27P [15/841] Troubleshooting 15
Table of Contents
xv
Jitter Buffer ............................................................................................................................ 665
Configuring Security Features ...............................................669
User Password ............................................................................................................................. 669
Administrator Password .............................................................................................................. 671
Auto-Logout Time ......................................................................................................................... 672
Phone Lock ................................................................................................................................... 674
Transport Layer Security .............................................................................................................. 684
Secure Real-Time Transport Protocol .......................................................................................... 694
Encrypting Configuration Files ................................................................................................... 697
802.1X Authentication ................................................................................................................. 702
Troubleshooting .....................................................................715
Troubleshooting Methods ........................................................................................................... 715
Viewing Log Files .................................................................................................................. 715
Capturing Packets ................................................................................................................ 725
Enabling Watch Dog Feature .............................................................................................. 728
Getting Information from Status Indicators ........................................................................ 730
Analyzing Configuration File ............................................................................................... 730
Troubleshooting Solutions ........................................................................................................... 733
Why is the LCD screen blank? ............................................................................................. 734
Why doesn’t the IP phone get an IP address? ................................................................... 734
Why does the IP phone display “No Service”? ................................................................. 734
How do I find the basic information of the IP phone? ....................................................... 734
Why doesn’t the IP phone upgrade firmware successfully? ............................................. 734
Why doesn’t the IP phone display time and date correctly? ........................................... 735
Why do I get poor sound quality during a call? ................................................................ 735
What is the difference between a remote phone book and a local phone book? ....... 735
What is the difference among user name, register name and display name? ............. 736
How to reboot the IP phone remotely? .............................................................................. 736
Why does the IP phone use DOB format logo file instead of popular BMP, JPG and so on?
................................................................................................................................................ 737
How to increase or decrease the volume? ........................................................................ 737
What will happen if I connect both PoE cable and power adapter? Which has the higher
priority? .................................................................................................................................. 737
What is auto provisioning? .................................................................................................. 738
What is PnP? .......................................................................................................................... 738
Why doesn’t the IP phone update the configuration? ...................................................... 738
What do “on code” and “off code” mean? ....................................................................... 738
How to solve the IP conflict problem? ................................................................................ 739
How to reset the IP phone to factory configurations? ....................................................... 739
How to restore the administrator password? .................................................................... 739
Why does the IP phone play the local ringback tone instead of media when placing a

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