Yealink SIP T2 Series Provisioning Manual page 28

Yealink IP Phones Auto Provisioning Guide
address of the provisioning server is contained in the message body.
After the IP phone obtains the provisioning server address from the PNP server, it will
connect to the provisioning server and perform the auto provisioning process during
startup.
Yealink IP phones support obtaining the provisioning server address by detecting DHCP
options during startup.
The phone will automatically detect the option 66 for obtaining the provisioning server
address. DHCP option 66 is used to identify the TFTP server.
You can configure the phone to obtain the provisioning server address via a custom
DHCP option. To obtain the provisioning server address via a custom DHCP option,
make sure the DHCP option is properly configured on the phone. The custom DHCP
option must be in accordance with the one defined in the DHCP server.
For more information on how to configure a DHCP server, refer to
Server on page 46.
To configure the DHCP option via web user interface:
1. Click on Settings->Auto Provision.
2. Mark the On radio box in the DHCP Active field.
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Configuring a DHCP