Yealink SIP-T21 - Manual (Page 134)

User Guide for the SIP-T21P/SIP-T21 IP Phone
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5. Mark the Local radio box in the Export System Log field.
6. Click Export to open file download window, and then save the file to your local
system.
You can also export the system log to a syslog server. Contact your system administrator
for more information.
Note
How to export/import phone configurations?
We may need you to provide the phone configurations to help analyze your problem. In
some instance, you may need to import configurations to the phone.
To export the phone configurations via web user interface:
1. Click on Settings->Configuration.
2. Click Export to open file download window, and then save the file to your local
system.
It is recommended you reset the system log level to 3 after you have the syslog file
provided.