Update Mode - Yealink SIP-T2 Series Auto Provisioning Manual

Yealink IP Phones Auto provisioning Guide
2. Enter the URL, user name and password of the provisioning server in the Server
URL, User Name and Password fields (the user name and password are optional).
3. Configure the desired update mode.
For more information, refer to
4. Click Confirm to accept the change.
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Update Mode

on page 35.