In the current scheme, the natural approach to this situation would
be:

   Agent                  B2BUA                     Monitor
       INVITE call-ID 1            INVITE call-ID 2
                                   id="call-ID 1"
       ---------------->           ---------------->
            186                         186
       <----------------           <----------------

      SUBSCRIBE call-ID 3         SUBSCRIBE call-ID 4
     Event:...target-call-ID 1  Event:...target-call-ID 1
       ---------------->           ---------------->


At the monitor, the original call would be indexed by the 'id'
parameter, which is "call-ID 1".  This allows matching with the
subsequent SUBSCRIBE.

Dale
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