A nationwide outage at Australia’s biggest telecom provider disrupted transport, mobile services and emergency calls, raising fresh concerns about the resilience of critical infrastructure despite assurances that the failure was not caused by a cyber attack.
Australia’s largest telecommunications company, Telstra, has restored services after a major nationwide outage disrupted train operations, left thousands without mobile coverage and prevented some emergency calls from connecting.
The outage began at about 04:30 local time on Wednesday, affecting mobile calls and data services across the country. While the disruption lasted roughly 12 hours, its impact was felt across transport networks, businesses and emergency response systems.
Telstra Chief Financial Officer Michael Ackland apologised to customers, saying the outage was caused by a software defect involving time-keeping servers at the company’s data centres in Sydney and Melbourne. He stressed that there was no evidence of a cyber attack.
“Australia can absolutely have faith in its biggest telco,” Ackland said, adding that the company invests heavily in network resilience and cybersecurity despite the complexity of operating a nationwide telecommunications system.
One of the most serious consequences was the disruption to emergency communications. Telstra confirmed it carried out welfare checks on customers who attempted to contact emergency services during the outage. Six people required immediate assistance after follow-up checks.
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Although backup systems that reroute emergency calls through other mobile networks functioned in most cases, authorities confirmed that around three dozen emergency calls failed to connect, prompting an official review.
Australian Prime Minister Anthony Albanese described the incident as “deeply concerning”, while Communications Minister Anika Wells announced that the Australian Communications and Media Authority (ACMA) would investigate what happened.
The outage also caused widespread disruption to transport. In the state of Victoria, all regional train services were cancelled, while parts of New South Wales experienced delays and service interruptions. National freight operations were also affected.
Businesses relying on digital payment services were hit as well. Around 80,000 merchants using the Tyro payment platform experienced service disruptions during the outage.
The incident comes less than a year after rival telecom provider Optus suffered a major nationwide outage that lasted about 13 hours, leaving millions without service and preventing many Australians from contacting emergency services. That outage was later linked to three deaths and resulted in regulatory penalties against the company.
Wednesday’s disruption has renewed debate over the reliability of Australia’s telecommunications infrastructure, particularly as mobile networks increasingly support emergency services, transport systems and financial transactions.
While Telstra says services have now been fully restored, the investigation is expected to examine why backup safeguards failed for some emergency callers and whether additional measures are needed to prevent similar nationwide outages in the future.
