In Car Aux Speaker & Phone Mic Issue

Hi,
    When connecting the OnePlus 5 via aux 3.5 jack cable the phone disables the phone mic.



Previous Android & Apple phones I've used continue to use the phone mic but use the car speakers via the aux output.



Is there a setting that can be changed for this? I've got an older car and it stops me from using the phone while driving?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References:
forums.oneplus.net/threads/in-car-aux-speaker-phone-mic-issue.615887/

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