Q: Bluetooth Car Pairing Problem

Product: Iphone 5S

IOS 8.3

Problem

1.I´ve been using my iphone pairing with my car soundsystem (Mitsubishi ASX)  through bluetooth and it works perfectly.

2. After updating IOS to version 8.3 Ive been facing the problem which cant get the sound of my telephone calls into car speakers (can listen or talk on my phone calls).

3. I do can play music from my iphone in the car soundsystem, but cant listen/talk my phone calls.

Tried

a) Reseting and rebooting my iphone and car sound system.

b) reseting all bluetooth configurations

Important:
I can play music from my iphone through bluetooth in my car soundsystem, but I can talk/listen my phone calls.