Problem with car stereo BT connection

I recently installed a SONY MEX 4200 BT car stereo, which allows bluetooth connectivity and has built-in mic for handsfree function. The problem I'm facing is that while my NEXUS 6p is connected via bluetooth to the car stereo and I accept a call, nothing is heard from the speakers. Making a call while connected works flawlessly, so does playing music from my NEXUS. My wife has a HUAWEI P9 lite, and has no problem making or accepting calls through the car stereo. I've tried the usual suggestions to solving BT connectivity issues, but the problem persists. Any suggestions?

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There are other ways aside from bluetooth

I've read quite a few other complaints with their NEXUS 6p connectivity with car stereo. I'm not sure if by this time they have addressed that already, but with problems like this I always like to go and find alternatives.

Bluetooth isn't the only way to connect to your car's audio. I've researched about this before because I got a terrible experience with my previous Huawei phone which got me frustrated about it's bluetooth connectivity. Worked around the problem by connecting it thru an FM transmitter which I chose from other connectivity options. You can find some more way of doing that like suggested ways here:

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