Optus will be held accountable after a serious triple-zero outage, as the role of private companies in delivering emergency calls is reconsidered.

Pressure is continuing to mount on the telco giant after it experienced a major outage that has been linked to up to four deaths, including that of a newborn baby.

It's the second time in two years an Optus network issue has prevented Australians from accessing the emergency line, fuelling anger over its failure to implement the recommendations from a review into the first major outage.

Federal Communications Minister Anika Wells said Optus would face the consequences of its actions.

"This is the second significant and egregious failure on the part of Optus," she told reporters on Monday.

"They have perpetuated a failure upon the Australian

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