Yealink phones are not a premium supported product, however they work nicely in the network, here is information about using them on the platform.
Log into yealink phone via browser
Obtain IP address from menu.

If you want to auto provision all yealink phones on your network you can add the following DHCP Option to your router and it will automatically provision on the network, if they have been setup in the portal
DHCP Option 66 = http://provisioning.vocphone.com/yealink
For most standard Yealink desk phones, you can find the IP address by following these simple steps:
Ensure the phone is idle (not on a call or in a menu).
For cordless systems, the IP address is associated with the base station, not the individual handset.
Here is a list of devices that should work out of the box on the platform, if you are wanting to work with another model, please contact support
We have the ability to auto provision Yealink Phones, the devices available can be found here
Yealink Auto Provision Devices and Firmware
If you have a supported phone, however it isn't provisioning please ensure you have the correct firmware version as mentioned in the Yealink document.
To get Yealink Firmware see below
To factory reset a Yealink phone, you can use the phone's keypad by pressing and holding the OK button for about 5-10 seconds until a prompt appears, then confirm the reset. Another method is to use the phone's web interface by finding the IP address, logging in, and navigating to the "Reset to Factory Settings" option in the settings or upgrade menu.