Scania S Series Bluetooth

Hello
Can anyone help with a bluetooth problem in a newish Scania S Series.

My phone is connected, it shows as connected, the infotainment centre intercepts the call as you would expect and shows I have a call, but there is no ringing except on my phone, nothing 5hrough the speakers and I can’t hear the caller and they can’t hear me.

I have done numerous factory resets on the radio, reset my iphone 8, had it briefly working cirrectly but wouldn’t reconnect oroperly the next morning. Have tried an samsung and a sony phone too. Both connect but nothing through the speakers.

Thanks for any help
Karl

When connected, check to see if volume is turned up, or does handset have Bluetooth volume, both my pixel and Lumia do.