Can’t hear caller CarPlay

When I receive a call through CarPlay I can see the caller ID and I answer the call. I cannot hear the caller but they can hear me.

I end the call and then immediately return the call. Now I can hear the other party and they can hear me.

Car is a jaguar e pace. Phone is 8+ with iOS 12.2.

Only happens on incoming calls. Doesn’t happen every time - have experienced problem 5 times in the last month . I’m using the latest available software from jaguar.

Have tried replacing the lightning cable and restarting the iPhone and forgetting the car and reconnecting.

None of these actions have fixed the problem.

This is a safety concern as my job is to provide emergency respond to failures of critical medical equipment in hospitals. If the caller does not reveal their caller ID then I don’t know which hospital their are calling from or who to call back.

Bluetooth connection works fine.