Yealink SIP-T23, Provisioning Manual

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Yealink IP Phones Auto Provisioning Guide
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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 IP phone
can connect to the provisioning server and perform the auto provisioning process.
Yealink IP phones support obtaining the provisioning server address by detecting DHCP
options.
The phone will automatically detect the option 66 and option 43 for obtaining the
provisioning server address. DHCP option 66 is used to identify the TFTP server. DHCP
option 43 is a vendor-specific option, which is used to transfer the vendor-specific
information. 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
Configuring a
DHCP Server on page 71 .
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.
3. Enter the desired value in the Custom Option (128~254) field.
4. Enter the desired value in the DHCP Option Value field.