NSArray *values = snapshot.value;
        NSString *audioString = values[0];
        NSString *UUID = values[1];
        if ([_UUID isEqualToString:UUID]) {
            return;
        }

        NSLog(@"Playing incoming audio clip:");
        NSData *data = [[NSData alloc] initWithBase64EncodedString:audioString options:0];
        NSString *appFile = [documentDirectory stringByAppendingPathComponent:@"sound.aac"];
        [data writeToFile:appFile atomically:YES];
        NSURL *fileURL = [NSURL URLWithString:appFile];

        NSString *path = [NSString stringWithFormat:@"%@/incoming.m4a", [[NSBundle mainBundle] resourcePath]];
        NSURL *soundUrl = [NSURL fileURLWithPath:path];
        _audioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:soundUrl error:nil];
        [_audioPlayer play];