The hardware ID (MAC address) is what binds the phone's settings in Genesys Cloud CX to a physical phone. A hardware ID is a unique identifier for each network device, such as a phone. You can define the phone configuration in Genesys Cloud CX by specifying various settings, such as phone name, phone model, base settings, line appearance, etc. However, to associate these settings with a physical phone, you need to enter the hardware ID of the phone in Genesys Cloud CX. Reference: https://help.mypurecloud.com/articles/about-phones/ https://help.mypurecloud.com/articles/add-a-phone/