Only one DLR requested for multi-part messages?

At line 277 of gw/sms.c (from CVS 2007-01-31) there is this comment  
and code, which only requests one DLR for a multi-part message:

         /*
          * if its a DLR request message getting split,
          * only ask DLR for the first one
          */
         if ((msgno > 1) && DLR_IS_ENABLED(part->sms.dlr_mask)) {
             octstr_destroy(part->sms.dlr_url);
             part->sms.dlr_url = NULL;
             part->sms.dlr_mask = 0;
         }

Why is this the case? Wouldn't you want to get a DLR for each part of  
the multi-part message to determine whether the entire message  
arrived (and would then be able to be reassembled on the handset) or  
not?

--
Giulio Harding
Systems Administrator

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