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Phone calls are going through phone speaker

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Apr 24, 2021
My AA enabled head unit and Galaxy A52 have been working fine together but recently the audio from phone calls has starting coming from the phone speaker whereas before it came from the car speakers. Other audio, ie music, navigation directions etc all continue to come from the car speakers as before, its just phone calls that has changed.
There has not been a change to the hardware so I assume this has been caused by a software change somewhere, has anyone else experienced this and/or know of a solution?