Yealink SIP T2 Series Provisioning Manual page 54

Yealink IP Phones Auto Provisioning Guide
7. Set the custom DHCP option (custom DHCP option tag number ranges from 128 to
254) and select the option type (Yealink supports String and IP Address option
types only). Click the OK button to finish setting the option properties. Click
save the change.
8. Click Named Policies-->Global, right click the blank area on the right of the main
page and then select New Option.
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