Windows MDM OMA DM Setup Phase-phone

Windows MDM OMA DM Setup Phase

After successfull enrollment device polls to the server

In request he gives its credentials in
<cred>
...
</cred>
And in reply to this server replies

But after that in the second request it send a challenge
<chal>
...
<chal>

for this what should be the status to be send...

Here is the request I'm getting from the Device

<SyncML xmlns="SYNCML:SYNCML1.2">
   <SyncHdr>
      <VerDTD>1.2</VerDTD>
      <VerProto>DM/1.2</VerProto>
      <SessionID>1</SessionID>
      <MsgID>2</MsgID>
      <Target>
         <LocURI>mdmServerUrl</LocURI>
      </Target>
      <Source>
         <LocURI>deviceId</LocURI>
      </Source>
   </SyncHdr>
   <SyncBody>
      <Status>
         <CmdID>1</CmdID>
         <MsgRef>1</MsgRef>
         <CmdRef>0</CmdRef>
         <Cmd>SyncHdr</Cmd>
         <Chal>
            <Meta>
               <Format xmlns="syncml:metinf">b64</Format>
               <Type xmlns="syncml:metinf">syncml:auth-md5</Type>
               <NextNonce xmlns="syncml:metinf">4Pilpjuggt4uOqqLFmmZYGjMVebjxlAlmVBkco0SbkQ=</NextNonce>
            </Meta>
         </Chal>
         <Data>200</Data>
      </Status>
      <Status>
         <CmdID>2</CmdID>
         <MsgRef>1</MsgRef>
         <CmdRef>4</CmdRef>
         <Cmd>Alert</Cmd>
         <Data>200</Data>
      </Status>
      <Final />
   </SyncBody>
</SyncML>