Yealink SIP-T23, Provisioning Manual

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Yealink IP Phones Auto Provisioning Guide
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The following figure shows the example messages of obtaining the TFTP server address
from a custom DHCP option:
Right click the root node of the custom option (e.g., option 128) shown on the above
figure, and select Copy->Bytes->Printable Text Only. Paste the copied text in your
favorite text editor to check the address, for example, tftp://192.168.1.100/.
Yealink IP phones support obtaining the provisioning server address from the IP phone
flash. To obtain the provisioning server address by reading the IP phone flash, make
sure the configuration is set properly.
To configure the IP phone Flash via web user interface:
1. Click on Settings->Auto Provision.