Soap Fault XML Format

<?xml version='1.0'?>
<env:Envelope xmlns:env='http://schemas.xmlsoap.org/soap/envelope/'>
    <env:Body>
        <env:Fault>
            <faultcode>999</faultcode>
            <faultstring>Usuário ou senha inválidos</faultstring>
        </env:Fault>
    </env:Body>
</env:Envelope>