Embattled telco Optus has apologised for a second triple-zero outage in less than a fortnight, as local executives prepare for showdown talks with the Singaporean owners.

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The latest issue is linked to a mobile phone tower in Dapto in New South Wales, which affected 4500 users in the area on Sunday between 3am and 12:20pm.

A review by the Telco has included nine failed calls to triple zero, but Optus says those affected "are OK" and the issue has been rectified.

One of those callers required an ambulance and used another phone to contact emergency services.

Another was trying to call emergency services but couldn't get through and had made

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