Optus is yet to implement changes recommended after a previous national outage crippled its network. Photo: Dean Lewins/AAP PHOTOS

Optus's boss has staked his leadership on avoiding another triple-zero outage disaster, as the prime minister labels the fatal event "completely unacceptable" amid questions about offshore call centres.

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As the fallout continues from the provider's catastrophic outage - linked to four deaths - chief executive Stephen Rue offered a guarantee Optus would not let a similar thing happen in the future.

His assurance came despite a barrage of criticism of Optu

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