Description:
------------
When I call a webservice, it works on Java and SoapUI, fails in PHP.
Java & SoapUI return a list, PHP return a stdClass with nothing.

// SoapUI
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:man="#namespace#">
   <soapenv:Header/>
   <soapenv:Body>
      <man:fetchCustomerDevices>
         <caller-id>#called-id#</caller-id>
         <customer-id>#customer-id#</customer-id>                  
      </man:fetchCustomerDevices>
   </soapenv:Body>
</soapenv:Envelope>

// Java  
service.fetchCustomerDevices(
        #called-id#, 
        new BigInteger(#customer-id#), 
        null, 
        false);
			
// PHP
$arguments = 
    array(
        'caller-id' => '#called-id#',
        'customer-id' => #customer-id#,
        'device-serial' => null,
        'sendEmail' => false
    );

$soapClient = new \SoapClient($wsdl, null);
$result = $soapClient->fetchCustomerDevices($arguments);