Top Optus executives and senior government officials will face the music at a parliamentary inquiry into their response to a triple-zero outage linked to the deaths of three people.

A Senate probe into the debacle was given the green light last week and will hold its first hearing on Monday.

Optus chief executive Stephen Rue is among those expected to face a barrage of questions, along with the telco's chairman John Arthur, former chairman Paul O'Sullivan and chief financial officer Michael Venter.

Officials from the communications watchdog, the Australian Communications and Media Authority, will also find themselves in the hot seat.

Senators are hoping to better understand what caused the September outage, which stopped hundreds of Australians from making triple-zero calls.

The inqui

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