Specifications

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