An overseas hacker triggered almost 2000 fake calls to emergency call centres causing disruption to triple zero services.
An estimated 1800 calls were made to emergency call centres run by Telstra between 6-8am on Saturday morning, impacting some call response times.
Although many of the 'blank' calls - which had no one on the other end - were blocked, any with the prefix of 000 made it through.
An overseas hacker triggered almost 2000 fake calls to emergency call centresiPhone transfer software
Filters to stop automated attempts to call international numbers failed, impacting some call response times
The robo-calls were made from a customer of telecommunications company Vocus, who have confirmed a phone exchange system had been compromised.
A spokesperson explained this enabled 'an external party to attempt international toll fraud'.
He said the business' fraud filters meant 'algorithmically-generated