I emailed Qatar Airways concerning an issue I had with their baggage ticketing on international flights. They kindly responded with the following verbatim email statement:
"Baggage tagging : As per procedures, the check in agent will tag the bag to the final International port of entry as reflected in the ticket itinerary. It is required of every passenger to collect their bags at the final port and recheck their bags on domestic carriers after having cleared the bags from the customs hall."
As in our personal case, this requires rechecking bags and paying the additional baggage fees of domestic carriers, not to mention the hassle of carting bags to the connecting airline check-in counter.