Optus has apologised for a second network outage in less than a fortnight, which impacted nine triple zero calls in New South Wales.

The telco confirmed there was a disruption to its mobile phone tower site in Dapto, near Wollongong, between 3am and 12.20pm on Sunday.

“Optus continues to investigate the cause of an issue involving a mobile phone tower site in the Dapto area in NSW. The issue has been restored,” an Optus spokesperson said.

“We have investigated the impact of the issue on calls made between 3am and 12.20pm yesterday, including calls made to the triple zero network, and have confirmed with police, all callers who attempted to contact emergency services are ok.

“We sincerely apologise to any customers who were impacted.”

It is understood one caller who required an ambulan

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