Optus has revealed a network failure impacted its ability to carry Triple Zero calls in three states and territories on Thursday, with at least three deaths linked to the incident.

The telco said the failure occurred during a “network upgrade” and led to " approximately 600 customers " in South Australia, the Northern Territory and Western Australia being unable to get through to emergency services.

Telcos that experience such failures must conduct welfare checks on households that attempted to make a call during the outage.

Optus said that its welfare checks so far uncovered three instances involving “households where a person tragically passed away.”

“These welfare checks are ongoing,” the telco said.

Optus CEO Stephen Rue apologised for the failure and launched an “immediate inve

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