Optus has apologised for a second triple-zero outage in as many weeks as failures to re-route calls through other networks are back in the spotlight.

Subscribe today for the news that matters

Login or signup to continue reading LIMITED TIME OFFER All articles from our website & app The digital version of Today's Paper Crosswords, Sudoku and Trivia All other regional websites in your area Continue

The latest blackout - dubbed "unacceptable" by NSW Premier Chris Minns - is linked to a mobile phone tower in NSW that affected 4500 users in the Dapto area on Sunday between 3am and 12.20pm.

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

The NSW premier lambasted the failure in t

See Full Page