I'm attempting to write a PHP script that will connect to the SOAP client for our SightMax interface. With the code below I am able to print out a list of functions available however when I try and call any function I am getting the the following error.

<?php

$client = new SoapClient('http://domain.com/SightMaxWebServices/SightMaxWebService.svc?wsdl', array('soap_version' => SOAP_1_2));

var_dump($client->__getFunctions());

$result = $client->__call("GetSiteSummary", array());

echo "<pre>";
print_r($result);
echo "</pre>";

?>

Fatal error: Uncaught SoapFault exception: [s:Sender] The SOAP action specified on the message, '', does not match the HTTP SOAP Action, 'SmartMax.SightMax.Agent.Operator/IRemotedWebsiteAdministrator/GetSiteSummary'. in test2.php:7 Stack trace: #0 test2.php(7): SoapClient->__call('GetSiteSummary', Array) #1 {main} thrown in test2.php on line 7