Optus sent emails notifying the federal communications department about a deadly triple-zero outage to the wrong email address and underplayed the severity of the issue, a parliamentary hearing has heard.

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The Singaporean-owned telco was required by regulation to notify the department about the emergency call outage, which occurred after a routine firewall upgrade on September 18 and was linked to three deaths.

Optus sent two emails to the department on the day, at 2.45pm notifying about the outage and another at 2.52pm advising the matter had been resolved, department deputy secretary for communications and media James Chisholm said.

But th

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