User Guide

Yealink IP Phones Auto Provisioning Guide
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9. Scroll down and double click the custom option 128.
10. Fill the provisioning server address in the input field.
11. Click the OK button to finish setting a custom option.
12. Click to save the change.
Add the Option 66 via DHCP Turbo
You can add the option 66 via DHCP Turbo. The following shows the detailed processes.