Users who send audio streams cannot record or play audio through the Bluetooth speaker. If the app does not use the CallKit, the following happens: If you set the Bluetooth device as the audio route for recording, the system switches the audio route for playback to the Bluetooth device accordingly.Ī Bluetooth speaker can only record audio during a system phone call. On an iOS device, the audio route for audio inputs and outputs must be the same. If the default settings mentioned above conflict with the audio routes you want, you need to change them when connecting your iOS device to a Bluetooth device. 
If a user has not answered any phone call, the default audio route is the Bluetooth device. If a user has answered phone calls, the default audio route is the one used by the last phone or VoIP call. The default audio route for a VoIP call after connecting an iOS device to a Bluetooth device: After tapping the answer button on a Bluetooth device, the default audio route is the Bluetooth device. 
After tapping the answer button on iPhone, the default audio route is the iPhone speaker.The default audio route for a phone call after connecting an iOS device to a Bluetooth device: Phone calls also include FaceTime calls and other calls implemented with CallKit. The iOS system selects audio routes for phone and VoIP calls, and the default audio routes are different from what you expect. Cannot record and play audio through a Bluetooth speaker.Failure to answer calls through a Bluetooth headset.After connecting a Bluetooth device to an iOS or Android device, you may encounter the following issues:
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