       SippPixMapUnref pixmapList
              Delete the handles in the list pixmaplist which are
              assocated with images.  This lowers  the  reference
              count on the pixmaps.  The data associated with the
              pixmaps will not be deleted until there are no more
              references.  If  ALL  is specified, then all pixmap
              handles are unreferenced.
              (NOTE: Currently there is no other way  to  keep  a
              reference  on  a  pixmap  except throuh its handle.
              This command always deletes pixmaps.)
