       SippObjectUnref objectlist|ALL
              Delete the handles in the list objectlist which are
              associated with objects.  This lowers the reference
              count on the objects.  The data associated with the
              object will not be deleted until the  objects  that
              reference them are deleted.

              If  ALL  is  specified, then all object handles are
              deleted.  The only objects that will  be  left  are
              those  that  are  subobjects  of  WORLD.  To delete
              those objects,  decrement  their  reference  counts
              with the command:

                  SippObjectSubSubobj WORLD ALL
