I'm flying Auckland to Manila on a Filipino passport, transiting through Sydney. Both flights are on the same carrier and there is no requirement to collect the bags and re-check them in Sydney. The transit time in Sydney is less than 8 hours so based on that information I see there is no requirement for a Transit Visa (Class 771).
HOWEVER... the connection in Sydney is 1hr 50 mins. It should be long enough, but what if there is a delay in the Auckland to Sydney leg that causes a missed connection in Sydney? The next flight from Sydney to Manila is the following day and Sydney is not a 24 hour airport so I would need to leave the airport for accommodation, but have no transit visa. I have tried contacting Sydney airports, the airlines and Australian immigration, but they all pass the buck to one another.