QF crew replacements

[ken nielsen]

Just curious. I know that Qantas have standby crews at Australian ports. A while back I was on QF 7 to Dallas which was delayed several hours so the crew would have been out of hours on arrival. They switched the cabin crew from another flight and called in a standby technical crew.
What does the airline do when this happens at a foreign port? Presumably there are no standby crew members.