Title AVAudioSession microphone recording changes Bluetooth audio route in vehicle Hi everyone, I’m developing an iOS app called HearSave to help drivers safely remember and save songs they hear while driving. The app performs a very simple task: the user presses a button, the app records a short audio sample for music recognition, then immediately stops recording. I’m trying to understand whether the behaviour I’m seeing is an expected limitation of iOS audio routing or whether there is a better AVAudioSession configuration. Test setup iPhone connected to a vehicle via Bluetooth. Vehicle playing DAB radio. App requests microphone access and starts recording. Recording lasts approximately 7 seconds. Behaviour observed As soon as recording begins: The vehicle changes into a voice-call style audio route. DAB audio becomes muted. The vehicle’s volume control changes to voice volume. When recording finishes, the radio does not automatically recover until the user manually changes the audio source away from DAB and back again. I’ve experimented with several Expo Audio / AVAudioSession configurations, including releasing the audio session immediately after recording and adjusting audio session options, but the behaviour remains the same. My questions Is this expected behaviour when an iOS app starts microphone recording while connected to a vehicle over Bluetooth? Is there an AVAudioSession configuration that allows brief microphone capture without causing the vehicle to switch audio routes? Is it possible to explicitly use the iPhone’s built-in microphone while remaining connected to the vehicle via Bluetooth? If this behaviour is unavoidable over Bluetooth, is this also expected behaviour for native CarPlay apps, or are different audio routing capabilities available to CarPlay applications? Any guidance or documentation would be greatly appreciated. Thank you.