User Guide

Yealink IP Phones Auto Provisioning Guide
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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 58.
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. Click Confirm to accept the change.
During startup, the phone will broadcast DHCP request with DHCP options for obtaining the
provisioning server address. The provisioning server address will be found in the received DHCP
response message.
After the IP phone obtains the provisioning server address from the DHCP server, it will connect
to the provisioning server and perform the auto provisioning process during startup.
For more information on the DHCP options, refer to Yealink_SIP-T2_Series_T19(P)
E2_T4_Series_IP_Phones_Administrator_Guide_V81 , Yealink IP DECT Phone Administrator
Guide_V81 or Yealink_SIP-T5_Series_Smart_Media_Phones_Administrator_Guide .