calling .net webservice on php code

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Dear all
I trying to call .Net webservice from my PHP code.
The WSDL as below:

 POST /SMCIVRServices.asmx HTTP/1.1
Host: 192.168.100.16
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://tempuri.org/CardCheck"

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <CardCheck xmlns="http://tempuri.org/">
      <CardNumber>string</CardNumber>
    </CardCheck>
  </soap:Body>
</soap:Envelope>
HTTP/1.1 200 OK
Content-Type: text/xml; charset=utf-8
Content-Length: length

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Body>
    <CardCheckResponse xmlns="http://tempuri.org/">
      <CardCheckResult>boolean</CardCheckResult>
    </CardCheckResponse>
  </soap:Body>
</soap:Envelope>

and this is my code:

$wsdl = "http://192.168.100.16:8022/SMCIVRServices.asmx?wsdl";  
$soap_client = new SoapClient($wsdl);   
$CN = array ('CardNumber' => $CardNum);
$response = $soap_client->__soapCall('CardNumber', array( $CardNum => $CN ));

$CardNum Variables have a value that get from input.
I could not connect to webserice.


Any help will be appreciated.
Thanks in advance.