Optus has revealed a technical problem with triple-zero calls affected hundreds of customers. Photo: Joel Carrett/AAP PHOTOS

A technical glitch caused hundreds of triple-zero calls through Optus to fail in three Australian states, including in households where people died.

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Up to 600 households in South Australia, Western Australia and the Northern Territory were impacted by the triple-zero outage during a network upgrade on Thursday, Optus chief executive Stephen Rue said.

"I have been advised that in the process of conducting welfare checks, three of the triple-zero calls involved

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