wso2 esb call iis web service with windows security

I try to call a soap web service locate on iis 7 server with windows authentication. I always receive an 401. How can I add user/password information ?

<?xml version="1.0" encoding="UTF-8"?>
<api xmlns="http://ift.tt/IrJ6pr" name="Test" context="/test">

     <property name="POST_TO_URI" value="true" scope="axis2"/>
     <header name="Action" value="http://ift.tt/1apK7w4"/>
     <property name="str_id" value="ENTETE"/>
     <payloadFactory media-type="xml">
        <format>
           <Reg xmlns="http://tempuri.org/">
              <text_fichier>$1</text_fichier>
           </Reg>
        </format>
        <args>
           <arg xmlns:soap="http://ift.tt/sVJIaE"
                evaluator="xml"
                expression="get-property('str_id')"/>
        </args>
     </payloadFactory>
     <send>
        <endpoint><adress uri="http://iisserver/test.asmx"/>
        </endpoint>
     </send>
  </inSequence>
  <outSequence>
     <send/>
  </outSequence>