iphone 6 disconnects from car bluetooth and hangs up without placing the call when using Voicecalling function

HI All,

I am using Iphone 6+ and I am having trouble placing calls using voicecalling function whether with Siri or just the normal voicecalling functions. It all works up to the part after it says you are calling the person then the phone disconnects. It disconnects from the car's bluetooth and then hangs up the phone without placing the call.

Voice call function and Hey Siri calling function works out of the car.

Siri Voice call function used to work with my car using the ios7 so I think they have changed the programming somehow.