Optus has failed Australians, Anthony Albanese says, as the Singaporean owners of Optus stand behind embattled chief executive Stephen Rue over repeated triple-zero failures.

The prime minister said his government was not satisfied with the behaviour of Optus and its handling of an "unacceptable failure of service".

"Optus has let down its customers and has let down the nation," he told reporters in Abu Dhabi on the last stop of his international trip.

His comments followed a crisis meeting between Singtel chief executive Yuen Kuan Moon and federal Communications Minister Anika Wells in Sydney on Tuesday following two emergency call outages in a fortnight.

The pair, flanked by Mr Rue and the Optus chair John Arthur, discussed technical details about the outages and ways to restore trus

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