No ringtone on inward calls on car Bluetooth

[Android Central Question]

I have a Samsung S9+ paired to my Bluetooth.
Until recently , I would be alerted to an inward call by 2 rings.
For some reason now whilst I am able to use Bluetooth there is no 2 rings.
On radio set the phone number will show or "talking" and I can converse with the caller normally.
Any ideas as to what need to be done to get the 2 rings alert of an incoming call.

 

[Peter R4]

Problem solved.
In Phone settings "answering and ending calls" it was set to "customise" which by default is set to zero .
Changed to 5 seconds and all good.