What about calling?
The Echo Auto is primarily designed for information from Alexa's services and playing music, triggered by voice control. It does allow some calling functions, however. Firstly you can use it to call other Echo devices using Alexa Calling. Secondly, because Alexa Calling will also place outgoing calls to your contacts, it can be used to call anyone in your address book, if you've synced that with the Alexa app.
You might decide you don't want to share all your contacts on your phone with Amazon, because that potentially means anyone can use any Alexa device signed into your account to call your contacts.
In our opinion, the best option for calling is to use whatever connection and calling options your car provides, regardless of the Echo Auto.
Often there's easy access to calling direct from your car already. When you do make a call your car should then handle that call and cut out anything that the Echo Auto is doing. That will also mean that you control the call from your car's controls, like steering wheel buttons.
https://www.pocket-lint.com/cars/news/amazon/152634-how-to-setup-your-amazon-echo-auto/