This have solved the problem.
if phone rings via car Bluetooth the music stops, then returns after phone conversation has finished 😁
http://Bluetooth 5.0 Receiver, MaedHawk Bluetooth Aux Adapter/Portable Wireless Audio Car Kit (A2DP, Built in Microphone, Dual Link) with 3.5mm Jack for Home Music Streaming Stereo,Headphones,Speakers https://www.amazon.co.uk/dp/B086VZQG55/ref=cm_sw_r_cp_api_fabc_4PAW9F835VNPYHAKMZ0M?_encoding=UTF8&psc=1