Web Service security error

I am getting the below erro when testing my web service,

<SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
   <SOAP-ENV:Body>
      <SOAP-ENV:Fault>
         <faultcode>SOAP-ENV:Server</faultcode>
         <faultstring>SOAP Security Header UsernameToken is required for operation 'ContactQueryByExample'.(SBL-EAI-05162)</faultstring>
         <detail>
            <siebelf:siebdetail xmlns:siebelf="http://www.siebel.com/ws/fault">
               <siebelf:logfilename>CRMMobileObjMgr_enu_0010_10485770.log</siebelf:logfilename>
               <siebelf:errorstack>
                  <siebelf:error>
                     <siebelf:errorcode>SBL-EAI-05162</siebelf:errorcode>
                     <siebelf:errorsymbol>IDS_EAI_WS_NO_USERNAMETOKEN</siebelf:errorsymbol>
                     <siebelf:errormsg>SOAP Security Header UsernameToken is required for operation 'ContactQueryByExample'.(SBL-EAI-05162)</siebelf:errormsg>
                  </siebelf:error>
               </siebelf:errorstack>
            </siebelf:siebdetail>
         </detail>
      </SOAP-ENV:Fault>