 Since this incident all Boeing 717 aircraft operated by Qantas (Qantaslink) have been fitted with cameras and the flight deck door is bullet proof.Upon further investigations by the airline, it was found one of the cabin crew used the international code for hijacking over the interphone to the flight deck.The crew member states she got a reply, however the flight deck crew never heard the message, and found out much later that an attempted hijacking had occurred and crew were injured.