What are the reasons for the other party not being able to hear clearly when making calls via car Bluetooth?

[PiperRose]

There may be too much noise when the car Bluetooth is on, so you can try turning off the Bluetooth to make calls. The functions of car Bluetooth are as follows: Eliminating noise and echo: Using advanced digital signal processors and voice equipment, it is suitable for any harsh environment, eliminating background noise and echo, allowing both parties to enjoy high-quality call effects, with an effective range of 10 meters; Automatic identification of mobile phones: It can connect with mobile phones without the need for cables or phone holders. You can control the phone without touching it, even keeping both hands on the steering wheel, using voice commands to answer or make calls. Users can conduct calls through the car's audio system.