Step# EE                                  PKI management entity
 1   format request
       message
 2                  ->     request     ->
 3                                        handle or forward
                                            request
 4                                        format ip/cp/kup/error
                                            with status "waiting"
                                            response in case no
                                            immediate final response
                                            is available
 5                   <- ip/cp/kup/error <-
 6   handle
       ip/cp/kup/error
       with status
       "waiting"

--------------------------  start polling  --------------------------

 7   format pollReq
 8                     ->    pollReq   ->
 9                                        handle or forward pollReq
10                                        in case the final response
                                            for the original request
                                            is available, continue
                                            with step 14
                                          otherwise, format or
                                            receive pollRep with
                                            checkAfter value
11                     <-    pollRep   <-
12   handle pollRep
13   let checkAfter
       time elapse and
       continue with
       step 7

-----------------  end polling, continue as usual  ------------------

14                                        format or receive
                                            final response on
                                            the original request
15                     <-   response   <-
16   handle final
       response