Error, status 200 load Ajax

I have a call ajax that falls in callback error and brings me a status 200 and statusText load .

Follow the ajax:

$.ajax({


          type: "GET",
          crossDomain: "true",
          dataType: "jsonp",
          contentType: "text/xml", 
          url: "http://macchips.macpontoweb.com.br/WSVisita/Services/Comum/Autenticacao/AutenticacaoSrv.svc?Login",
          data: 'usuario='+usuario.value+'&senha='+senha.value,

          success: function(resposta){ 

           window.location.href="login.html";        

          alert(resposta);   

          },

          error: function(error){
            var falha = JSON.stringify(error);

            alert("Erro " + falha);
          }

        });

I'm trying to access a method from a webservice from another domain via a mobile application, using cordova