A fresh triple-zero outage blunder is liekly to keep the fore to Optus' feet. Photo: Erik Anderson/AAP PHOTOS

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 thos

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