Issues with monitoring and changing WebRTC audio output device in WKWebView

I am developing a VoIP app that uses WebRTC inside a WKWebView.

Question 1: How can I monitor which audio output device WebRTC is currently using? I want to display this information in the UI for the user .

Question 2: How can I change the current audio output device for WebRTC?

I am using a JS Bridge to Objective-C code, attempting to change the audio device with the following code:

void set_speaker(int n)
{
	session = [AVAudioSession sharedInstance];
    NSError *err = nil;
     
    if (n == 1) {
        [session overrideOutputAudioPort:AVAudioSessionPortOverrideSpeaker error:&err];
    } else {
        [session overrideOutputAudioPort:AVAudioSessionPortOverrideNone error:&err];
    }
    
 
    
}

However, this approach does not work.

I am testing on an iPhone with iOS 16.7. Is a higher iOS version required?