For certified Yealink SIP phones, you can define manufacturer-specific settings via the manufacturer's web interface. The IP address can be found on the device under "Menu | Status". You can log in with the user name "admin". Alternatively, you can define the settings directly on the device under "Menu | Settings | Advanced Settings".

To access the settings, you need the administrative password. The password is automatically set when you install your customer system and applies to all Yealink certified SIP phones provided in your network. The password cannot be changed.