[fw-webservices] parameters are not filled in soap call

Hello everyone,

I am trying to send a soap request this way:

public function request($method, $parameters){

$request = $this->client->__call($method, $parameters);

$this->logLastRequest($request, $method);

return $request;

} 

But when i do getLastRequest I see that the parameters are not filled. 

I should have something like:

<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:web="XXXXXXXXXXXXXXXXXXX">

   <soapenv:Header/>

   <soapenv:Body>

      <web:findSubscriptionSMS>

         <phonenumber></phonenumber>

      </web:findSubscriptionSMS>

   </soapenv:Body>

</soapenv:Envelope

But the phoenumber node is left out.

Can anyone help me out?

Kind regards,

jsanders