webrtc+callkit免提按钮bug

RTCConfiguration *configuration = [[RTCConfiguration alloc] init];

[RTCAudioSessionConfiguration webRTCConfiguration].categoryOptions = AVAudioSessionCategoryOptionAllowBluetooth|AVAudioSessionCategoryOptionAllowBluetoothA2DP|AVAudioSessionCategoryOptionDuckOthers;

这样设置webrtc解决了我的问题