• Optus’s 76-minute disruption affected some voice calls across four states and territories, including some emergency calls
  • Existing rules require carriers to preserve access to network-management tools during core-network failures and test changes affecting emergency calling

The fact

Australia’s government pledged to strengthen telecommunications resilience on 13 September after an Optus outage disrupted some emergency calls. Communications Minister Anika Wells said no infrastructure could be completely resilient, but the government wanted networks to be as resilient as possible.

The 76-minute disruption on 11 September affected some voice calls in Victoria, South Australia, Tasmania and the Northern Territory. Optus said its monitoring detected the problem within minutes and teams began restoring service while escalation procedures were activated. The technical cause remained under investigation.

Australia already has rules aimed at keeping recovery systems available during serious failures. Requirements registered by the Australian Communications and Media Authority in October 2025 say carriers must maintain remote access to network-management tools, with backup provision if the core network fails. Changes that could affect emergency calls must also be thoroughly tested. Separate exercises allow carriers and emergency agencies to practise their response to simulated outages and identify problems that could delay restoration.

The assessment

The useful test of network resilience is not simply whether backup equipment exists. Engineers must still be able to reach the management systems needed to restore service when part of the network is already failing. Australia’s existing rules address that dependency directly.

Controlled testing can then show whether those recovery arrangements work in practice. A simulated failure can reveal whether engineers retain access to the systems they need and whether the recovery procedure restores the affected service. Exercises with emergency agencies test whether the organisations involved can coordinate once a disruption reaches critical services.

For BTW readers, the investigation should show whether those safeguards were relevant to the latest outage. If the recovery controls worked as intended, attention will move elsewhere in the service path. If they did not, the findings should identify a specific weakness that Optus needs to correct.

What to watch

Watch for the investigation’s explanation of what failed, how service was restored and which recovery controls worked as intended. Any corrective action that is later tested against the same failure would provide stronger evidence that Optus is better prepared for a repeat incident.