Correspondence For The Timeframe 18 September 2025 To 23 September 2025 Between The Emergency Communication And Resilience Branch, Communications And Media Group Of The Department And Optus And/or…

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On 18 September 2025, Optus notified the Department of Infrastructure's Emergency Communication and Resilience Branch of a Triple Zero outage affecting customers in South Australia and Western Australia, traced to the Regency Park exchange. The initial notification was sent at 2:45 PM, followed by an update 7 minutes later indicating the issue had been resolved with approximately 10 calls impacted. Optus confirmed welfare checks were underway for affected callers and committed to providing further updates. A subsequent email from 20 September shows departmental officials (including Samuel Grunhard and James Chisholm) requesting additional information from Optus regarding the incident, with Optus undertaking to provide answers to the Department's questions.