Yealink SIP-T4X Provisioning Manual page 31

To enable PnP via web user interface:
1. Click on Settings->Auto Provision.
2. Mark the On radio box in the PNP Active field.
3. Click Confirm to accept the change.
Any PnP server activated in the network responses with a SIP NOTIFY message, and an
address of the provisioning server is contained in the message body. Then the phone
can connect to the provisioning server and perform the auto provisioning process.
Yealink IP phones support to obtain the provisioning server address from DHCP options.
You can configure the phone to obtain the provisioning server address from a custom
DHCP option, or the phone will automatically detect the Option 66 and Option 43. The
Option 66 is used to identify the TFTP server. To obtain the provisioning server by a
Obtaining the Provisioning Server Address
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