nusoap client, .NET document/literal server

I have a strange situation accessing methods on a .NET web service using a 
nusoap client.  Methods that take no parameters return correctly, but those 
that do require parameters invariably fail.  I noticed somebody else had a 
similar problem and the solution was to wrap the array of parameters in another 
array with a single element named after the service method.  I tried something 
similar, but to no avail.  (This is all on my local machine at the moment.)

    define("SERVICE", "http://localhost/project/projectService.asmx?WSDL";);
    $soapclient = new soapclient(SERVICE,'wsdl');
    $leader = array('leaderId'=>888);
    $params = array('listProjectsByLeader'=>$leader);
    $projectsByLeader = $soapclient->call('listProjectsByLeader', $params, 
"http://tempuri.org/";);

Following are the example request and response generated by VS.NET:

POST /project/projectService.asmx HTTP/1.1
Host: localhost
Content-Type: text/xml; charset=utf-8
Content-Length: length
SOAPAction: "http://tempuri.org/listProjectsByLeader";

<?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>
    <listProjectsByLeader xmlns="http://tempuri.org/";>
      <leaderId>int</leaderId>
    </listProjectsByLeader>
  </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>
    <listProjectsByLeaderResponse xmlns="http://tempuri.org/";>
      <listProjectsByLeaderResult>
        <anyType />
        <anyType />
      </listProjectsByLeaderResult>
    </listProjectsByLeaderResponse>
  </soap:Body>
</soap:Envelope>

Any suggestions as to how I can successfully pass even a simple parameter to my 
.NET web service would be gratefully received!



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