Anonymous Request No Session
This example illustrates an anonymous request and a session type of None, which closes the session after the response is sent out:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
<soap:Header>
<SessionType xmlns="http://siebel.com/webservices">None</SessionType>
</soap:Header>
<soap:Body>
<!-- data goes here -->
</soap:Body>
</soap:Envelope>