Singapore's Prime Minister, Lawrence Wong, has offered his condolences to the families of four Australians who died during an Optus network technical failure last month, which impacted hundreds of triple-0 calls.

On September 19, Optus revealed that a failed network update the day before meant that some triple-0 calls were made but went unanswered.

Four people died during the 13-hour outage , including an eight-week-old baby.

"First of all, I can fully understand the anger, frustration and outrage by what happened," he told the ABC.

" And I would like to certainly extend my condolences to everyone who's been impacted by the outage, especially the families and loved ones of those who lost their lives. "

The ABC asked Mr Wong about the Optus network failure because the Singapore

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