Yealink IP Phones Auto Provisioning Guide
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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.
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.