PHP soapClient xml soap envelope format error - php

Question

I call a method with php soapClient class, like this:
$client->ResetAppPassword($request);
and my envelope is send like this
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ns1="http://xmlns.xxxx.com/PATH/TO/V1/schema"
xmlns:ns2="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd">
<SOAP-ENV:Body>
<ns1:ResetAppPasswordRequest>
<ns1:username>TEST</ns1:username>
<ns1:app>TEST</ns1:app>
</ns1:ResetAppPasswordRequest>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
But the server response:
The message must be an instance of: {http://www.w3.org/2003/05/soap-envelope}Envelope
and this is because the service is specting other format:
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:sch="http://xmlns.xxxx.com/PATH/TO/V1/schema">
<soap:Body>
<sch:ResetAppPasswordRequest>
<sch:username>TEST</sch:username>
<sch:app>DMS</sch:app>
</sch:ResetAppPasswordRequest>
</soap:Body>
</soap:Envelope>
So the i already tried to send it via php-CURL but with this solution I need to parse the XML response, so this make the process really hard, because I want to manage the response as an object.
Can someone help me... PLEASSSE..