Echo cancellation workaround iOS

AVAudioSession.cs

using System.Runtime.InteropServices;
using UnityEngine;

public static class AVAudioSession
{
    [DllImport("__Internal")]
    private static extern void _SetupAudioModeForVideoCall();

    public static void SetupAudioModeForVideoCall()
    {
        if (UnityEngine.Application.platform == RuntimePlatform.IPhonePlayer)
        {
            _SetupAudioModeForVideoCall();
        }
    }
}

AVAudioSessionImpl.mm

#import <AVFAudio/AVAudioSession.h>

extern "C" void _SetupAudioModeForVideoCall(){
    // Retrieve the shared audio session
    AVAudioSession *audioSession = [AVAudioSession sharedInstance];

    NSError *error = nil;
    // Set the audio session category and mode
    [audioSession setCategory:AVAudioSessionCategoryPlayAndRecord mode:AVAudioSessionModeVideoChat options:0 error:&error];

    if (error) {
        NSLog(@"Failed to set the audio session configuration: %@", error);
    }
}