Web Socket Connection failed from Android Client

I am developing an Android client for a server where the requirement is continuous exchange of audio stream to the WebSockets-based server.

While connection with web sockets the android client throws the following error.

Closed draft org.java_websocket.drafts.Draft_10@b2fe9b40 refuses handshake

But I tried with following web socket uri. Connection getting succeeded. ws://echo.websocket.org

Code:

URI uri;
    try {
        // uri = new URI(
        // "ws://echo.websocket.org");
        uri = new URI(
                "ws://serverIP:9090/WebRtc/serverendpoint");

    } catch (URISyntaxException e) {
        e.printStackTrace();
        return;
    }

    mWebSocketClient = new WebSocketClient(uri) {
        @Override
        public void onOpen(ServerHandshake serverHandshake) {
            Log.i("Websocket", "Opened");
            mWebSocketClient.send("Hello from " + Build.MANUFACTURER + " "
                    + Build.MODEL);
        }

        @Override
        public void onMessage(String s) {
            final String message = s;
            runOnUiThread(new Runnable() {
                @Override
                public void run() {
                    TextView textView = (TextView) findViewById(R.id.messages);
                    textView.setText(textView.getText() + "n" + message);
                }
            });
        }

        @Override
        public void onClose(int i, String s, boolean b) {
            Log.i("Websocket", "Closed " + s);
        }

        @Override
        public void onError(Exception e) {
            Log.i("Websocket", "Error " + e.getMessage());
        }
    };
    mWebSocketClient.connect();

I tried the echo test from browser for the web socket(ws://serverIP:9090/WebRtc/serverendpoint) I have used. It's getting connected properly. But When I try that from both mobile or emulator, nothing works.

Please help me on this.