Skype via car Bluetooth?

I just bought a Samsung Galaxy S7, bound it to my car's Bluetooth and able to make/accept regular calls. However I cannot figure out how to make calls from Skype through car's Bluetooth. When phone is connected to bluetooth and I make a Skype call - call goes through phone's speaker, not through Bluetooth. Any advice on how to do it? P.S. I was able to it with my old Windows Phone, so I believe it should be possible with Android 6