Yealink SIP-T48G Administrator's Manual page 252

Microsoft Lync Edition Administrator's Guide for SIP-T2_Series and T4_Series IP Phones
To configure the level of the system log via web user interface:
1. Click on Settings->Configuration.
2. Select the desired level from the pull-down list of System Log Level.
3. Click Confirm to accept the change.
The system log level is set as 6, the informational level.
Note
Informational level
dial number), we recommend that you reset the system log level to 3 after providing the
syslog file.
To configure the phone to export the system log to a syslog server via web user
interface:
1. Click on Settings->Configuration.
2. Mark the Server radio box in the Export System Log field.
3. Enter the IP address or domain name of the syslog server in the Server Name field.
4. Click Confirm to accept the change.
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may make some sensitive information accessible (e.g., password