Nginx Configuration

      location ~* \.io {
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host $http_host;
            proxy_set_header X-NginX-Proxy true;
      
            proxy_pass http://localhost:9001;
            proxy_redirect off;
      
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
        }

Now you can install RTCMultiConnection and open port 9001.

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Disclaimer: This guide is taken from this link and credits goes to @Teranode.