Yealink SIP-T4X Administration Manual page 229

Administrator's Guide for SIP-T4X IP Phones
Local
To configure the AES keys via web user interface:
1. Click on Settings->Auto Provision.
2. Enter the values in the Common AES Key and MAC-Oriented AES Key fields.
3. Click Confirm to accept the change.
214
Web User Interface
on page 369.
Configure the AES keys.
Navigate to:
http://<phoneIPAddress>/servl
et?p=settings-autop&q=load