Our federal communications minister got the final version of the Optus Post-Incident Review yesterday. The report isn't public yet (they plan to release it "in due course") and while it wasn't supposed to explain the technical cause of the outage, the press release says "the disruption to some Triple Zero calls was predominantly caused by a failure of Optus 3G towers to wilt" - which is "an industry practice where signals from mobile towers are powered down during disruptions in order for Triple Zero to be carried by another network". Dunno what's in that report that's so sensitive that it has to be sat on indefinitely. I was looking forward to seeing what could be done to prevent such an epic network failure from happening again.
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