Yealink SIP-T21 - Manual (Page 133)

Troubleshooting
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5. Click Export to open file download window, and then save the file to your local
system.
How to export system log?
We may need you to provide debug log information to help analyze problem. By
default, you can export the debug system log information to local PC.
To export the system log to local PC via web user interface:
1. Click on Settings->Configuration.
2. Select 6 from the pull-down list of System Log Level.
The default system log level is 3.
3. Click Confirm to accept the change.
The web user interface prompts “Do you want to restart your machine?”. The
configuration will take effect after reboot.
4. Click OK to reboot the phone.
After the IP phone finishes reboot, the system log level is set as 6, the debug level.