Function description:
This function is the default setting of the system and cannot be modified manually.
Even if the phone rings, only the headset can hear the sound of the call after the phone is connected. The speaker of the phone does not emit sound. This is to prevent some people from missing calls by leaving their phones on the side while plugging in their headphones.
Notes:
If the phone is connected to the car audio system, the ringtone cannot be turned off.