Correspondence For The Timeframe 18 September To 22 September 2025 Between: The Department And Optus And The Department And The Minister's Office Relating To The Optus Triple-0 Outage On 18…

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On 18 September 2025, Optus experienced a triple-zero outage affecting customers in South Australia and Western Australia, originating from its Regency Park exchange. The company notified the Department of Infrastructure at 2:45 PM and reported the issue resolved by 2:52 PM, with approximately 10 calls potentially impacted. Optus undertook welfare checks on affected customers and commenced standard incident protocols. Subsequent correspondence on 20 September between Optus and Department officials, including the Minister's office, involved coordination regarding government and media communications about the incident. The disclosure includes notification emails and departmental liaison discussions during the four-day response period.