how to configure IB to reseave attachment from external party

we want to call a external ws that has a file (MTOM) in the response message .

How do i create a message structure to retrieve a response like this below

This is the response as it looks in soapUI :

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">

   <SOAP-ENV:Header/>

   <SOAP-ENV:Body>

      <ns3:HaalTaxonomiebestandOpResponse xmlns:ns3="http://haaltaxonomiebestandop.taxonomiedienst-01_00.dho2.ov.vlaanderen.be">

         <Repliek>

            <Context>

               <Naam>HaalTaxonomiebestandOp</Naam>

               <Versie>01.00.0000</Versie>

               <Bericht>

                  <Type>ANTWOORD</Type>

                  <Tijdstip>

                     <Datum>2015-03-24</Datum>

                     <Tijd>09:49:17.425</Tijd>

                  </Tijdstip>

                  <Afzender>

                     <Identificatie>dho2.ov.vlaanderen.be</Identificatie>

                     <Referte>c6dadd6e-1173-4b0b-9113-2542a4abdc00</Referte>