Yealink SIP-T23G - Customizing Your Phone; General Settings; Audio Settings; Contact Management

Obtaining the Address of Provisioning Server
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An example of screenshot is shown as below:
Yealink IP phones support obtaining the provisioning server address from the PnP server.
The IP phone broadcasts the PnP SUBSCRIBE message to obtain the provisioning server
address during startup. To use Plug and Play, make sure this feature is enabled.
To configure 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.