Callkit loudspeaker bug / how WhatsApp fixed it?

Question

I have an app with Callkit functionality. When I press the loudspeaker button, it will flash and animate to the OFF state (sometimes the speaker is set to LOUD but

Answer 1

I've fixed the issue by doing following steps.

• In CXAnswerCallAction, use below code to set audiosession config.

  RTCDispatcher.dispatchAsync(on: RTCDispatcherQueueType.typeAudioSession) {
  let audioSession = RTCAudioSession.sharedInstance()
  audioSession.lockForConfiguration()
  let configuration = RTCAudioSessionConfiguration.webRTC()
  configuration.categoryOptions = [AVAudioSessionCategoryOptions.allowBluetoothA2DP,AVAudioSessionCategoryOptions.duckOthers,
                                   AVAudioSessionCategoryOptions.allowBluetooth]
  try? audioSession.setConfiguration(configuration)
  audioSession.unlockForConfiguration()}
  

• After call connected, I'm resetting AudioSession category to default.

  func configureAudioSession() {
  let session = RTCAudioSession.sharedInstance()
  session.lockForConfiguration()
  do {            
      try session.setCategory(AVAudioSession.Category.playAndRecord.rawValue, with: .allowBluetooth)
      try session.setMode(AVAudioSession.Mode.default.rawValue)
      try session.setPreferredSampleRate(44100.0)
      try session.setPreferredIOBufferDuration(0.005)
  } 
  catch let error {
      debugPrint("Error changeing AVAudioSession category: \(error)")
  }
  session.unlockForConfiguration()}
  

Thanks to SO @Алексей Смольский for the help.