function validateTaxNumber(number) {
    checkTaxNumber.call(number, function(resp) {
        return (resp.success) ? true : false;
    });

    var checkTaxNumber = _.extend({
        className : 'Signup_Controller',
        call : function (number, callback) {
            this.invokeCtx('checkTaxNumber',
                number,
                function (resp, evt) {
                    if (evt && evt.status) {

                        if (resp && resp.success) {
                            console.log(resp);
                            console.log('success');
                            callback(resp);
                        } else {
                            console.log('error');
                            callback(resp);
                        }
                    }
                },
                {buffer : false, nmsp : false}
            );
        }
    },CCRZ.RemoteInvocation);
}