JSONP CROSS- DOMAIN WCF Service Response Fail

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C#

Javascript

WCF

jQuery

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This is the WCF Service code:

[OperationContract]
        [WebGet(RequestFormat = WebMessageFormat.Json, ResponseFormat = WebMessageFormat.Json, BodyStyle = WebMessageBodyStyle.Bare)]
        public String GreetJson()
        {
            Greeting g = new Greeting();
            g.Message = "Hello World!";
            Console.WriteLine("call received");
            JavaScriptSerializer serializer = new JavaScriptSerializer();

            return serializer.Serialize(g); ;
        }

and the client request:

$("#test").click(function(){
$.getJSON("http://192.168.10.183:8001/GreetJson",function(data)
            {
                alert("test=" + data);
            });
});
...
<img src="data/images/menu/highscore.png" alt="Highscore" id="test" />

if we use http://192.168.10.183:8001/GreetJson in a browser we get:
"{\"Message\":\"Hello World!\"}"

Our problem is that we don't receive any response from the server when we do getJSON request.

Console.WriteLine("call received"); //the message appears in the console but on the browser there is no alert box.
Any idea why?