Optus can expect "consequences" after another outage left people unable to contact Triple Zero in an "enormous failure", Communications Minister Anika Wells said.

Multiple people died during the network outage, during which they were unable to reach emergency services.

Following Optus chief executive Stephen Rue's admission yesterday that the telco had missed several warnings that calls to Triple Zero were not going through, Wells this morning confirmed Optus had been told about the issue but not acted on it.

"Optus will be held to account," she said.

"Optus and all telecommunications providers have obligations under Australian law to make sure emergency services calls go through."

Wells and Australian Communications and Media Authority head Nerida O'Loughlin did not specify what

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