Optus admitted up to 600 households in SA, WA and the NT were impacted by the triple-zero outage. Photo: Bianca De Marchi/AAP PHOTOS

Optus could face multi-million dollar fines and legal penalties after a botched network upgrade prevented people from making triple-zero calls and resulted in three deaths, including of an eight-week-old boy.

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The telco has admitted up to 600 households in South Australia, Western Australia and the Northern Territory were impacted by the triple-zero outage on Thursday.

SA police said an eight-week-old boy from the town of Gawler and a 68-year-old woman

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