Why can't I make a call if I dial on the car screens?

A

AC Question

why can't I make a call if I dial on the car screens?

My Galaxy s5 is synched to the PCM system in my Cayenne and makes calls successfully through the car system if I dial on the handset or select a number from the phonebook on the phone (and receives all calls ok - I answer and hang up using the Cayenne's controls). But if I dial the number on the Car screen or select a number from the same phonebook, but on the car using the car's controls, the number appears to dial for a moment and then stops and reverts back to the phone screen with no warnings or advice why it didn't dial. Help!
 

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