Optus chief executive Stephen Rue says human error by staff at home and abroad was responsible for the catastrophic Triple Zero failure that cost four lives.

Speaking at a press conference on Wednesday, Rue said emergency calls were not diverted away from the core part of the network in what he described as a “process breakdown”. He said the network engineers were based across Australia and Chennai, India.

“The first step in the process was not followed,” Rue said.

Optus CEO Stephen Rue updates media on the company’s response to its emergency communications failures on Wednesday. Credit: Sitthixay Ditthavong

“We have successfully completed similar upgrades in the past, and it should be reiterated that the issue occurred because this time there was a deviation from established proce

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