Supports audio transmission only, the call can only be controlled on the IP phone. You need to do the following: 1. Enable Deskphone Connection by utilizing Yealink USB Connect. 2. Adjust the audio transmission to headset by pressing the Headset button on the deskphone. 3. When receiving an incoming call, press the Phone button on the Base and then answer the call on the phone. 4. After the call ends, dock the headset to the Base/press the Phone button on the Base/press the MFB button of the headset to end the call.