Yealink SIP-T48G [12/465] Troubleshooting 31

Yealink SIP-T48G [12/465] Troubleshooting 31
Administrators Guide for SIP-T4X IP Phones
xii
Headset Prior ............................................................................................................................... 191
Dual Headset ............................................................................................................................... 192
Audio Codecs .............................................................................................................................. 193
Acoustic Clarity Technology ........................................................................................................ 197
Acoustic Echo Cancellation ................................................................................................. 197
Voice Activity Detection ....................................................................................................... 198
Comfort Noise Generation .................................................................................................. 199
Jitter Buffer ............................................................................................................................ 200
Configuring Security Features ...............................................203
Transport Layer Security .............................................................................................................. 203
Secure Real-Time Transport Protocol .......................................................................................... 209
Encrypting Configuration Files ................................................................................................... 211
Upgrading Firmware .............................................................215
Resource Files ........................................................................219
Replace Rule Template ............................................................................................................... 219
Dial-now Template ....................................................................................................................... 220
Softkey Layout Template ............................................................................................................. 221
Local Contact File ........................................................................................................................ 223
Remote XML Phone Book ............................................................................................................ 224
Directory Template ...................................................................................................................... 226
Super Search Template ............................................................................................................... 227
Specifying the Access URL of Resource Files ............................................................................ 228
Troubleshooting .....................................................................231
Troubleshooting Methods ........................................................................................................... 231
Viewing Log Files .................................................................................................................. 231
Capturing Packets ................................................................................................................ 234
Enabling the Watch Dog Feature ........................................................................................ 234
Getting Information from Status Indicators ........................................................................ 235
Analyzing Configuration Files ............................................................................................. 235
Troubleshooting Solutions ........................................................................................................... 236
Why is the LCD screen blank? ............................................................................................. 236
Why doesn’t the IP phone get an IP address? ................................................................... 236
How do I find the basic information of the IP phone? ....................................................... 237
Why doesn’t the IP phone upgrade firmware successfully? ............................................. 237
Why doesn’t the IP phone display time and date correctly? ........................................... 237
Why do I get poor sound quality during a call? ................................................................ 237
What is the difference between a remote phone book and a local phonebook? ........ 238
What is the difference between user name, register name and display name? .......... 238

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