Creating a speakerphone in a car

General Discussion
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Helllo !
Creating a speakerphone in a car.
Is it possible to control the phone from a microcontroller via bluetooth?
Interested in the possibility of dialing, accepting a call and talking.
It is necessary to create a device that:

  1. Gives a signal when an incoming call is received on the phone;
  2. You can pick up the phone by pressing the button;
  3. The device has a speaker and microphone with which you can conduct a conversation.;
  4. You can click on the button and the conversation will be over.;
    To put it simply, you need to make bluetooth handsfree, but on your own and with additional options.
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