Summary

  • ACMA alleges Optus Mobile breached sections 15 and 19 of the Telecommunications (Emergency Call Service) Determination 2019 on 1,005 occasions on 18 September 2025; the maximum penalty available is $250,000 per contravention.
  • The matter is at the pleadings stage: no defence, admissions, hearing dates or merits findings appear in the public record.
  • The action's distinctive contribution is evidentiary: admissions or court findings on how the 2025 failure happened and on remediation milestones are evidence operator statements alone cannot supply.

What is actually pleaded

According to ACMA's announcement as reported by Telecompaper, the regulator seeks declarations that Optus Mobile contravened the Telecommunications (Consumer Protection and Service Standards) Act 1999 on 1,005 occasions by failing to comply with sections 15 and 19 of the Telecommunications (Emergency Call Service) Determination 2019 — failing to give end-users access to the emergency call service, and failing to ensure emergency calls were carried to the relevant termination point. It also seeks pecuniary penalties to the Commonwealth, with a stated maximum of $250,000 per contravention. The Federal Register of Legislation record (legislation.gov.au) confirms the two obligations' subject matter. These are allegations; no court has made any merits finding.

Posture and the company's position

Optus's response is known only through Singtel's SGX bourse filing of 30 July 2026, reported by Light Reading: the company says it is reviewing the pleadings, will respond in due course, and cannot determine the quantum of any potential penalty, noting that any penalty is a matter for the court rather than a per-contravention calculation. No defence, hearing schedule or court file number appears in the public record located for this briefing; ACMA and the company both decline further comment while the matter is before the court.

Independent corroboration and the figures that do not agree

Non-operator coverage corroborates the filing: Nine.com.au (nine.com.au) and Telecompaper (telecompaper.com). Press accounts of the independent review led by Kerry Schott, released in December 2025, carry differing figures for failed Triple Zero calls — 75 per cent of 605 attempts in one account, 455 of roughly 600 in another — during an outage of almost 14 hours. The figures cannot be reconciled from the available excerpts and both are review-attributed, not court findings. The Schott review also found roughly ten mistakes by Optus and contractor Nokia, a 13-hour time to diagnosis, and unescalated call-centre warnings from five callers; it linked the outage to two deaths. The government's own statement — Communications Minister Anika Wells welcomed the action as addressing serious alleged failures (minister.infrastructure.gov.au) — mirrors ACMA's allegations without adding findings.

What this adds beyond prior coverage

BTW's earlier reporting on this subject is located and specific: the 19 September 2026 longform examined the 2023 ACMA penalties and what proves repair; the 25 September 2026 briefing traced the change-induced failure path across 2023 and 2025; the 14 and 18 September 2026 briefings covered the 2025 apology and the government's resilience pledge. None of that coverage treated the 2026 proceeding itself.

What the proceeding adds is a mechanism: if Optus admits or a court finds the 1,005 contraventions, the emergency-call obligations become court-established facts rather than regulator findings — evidence that survives changes in management, ownership or regulation. ACMA itself frames the action against the more than $12 million in infringement-notice penalties Singtel Optus subsidiaries paid after the November 2023 outage, a prior enforcement record that did not prevent the 2025 recurrence.

What would prove durable repair

The proceeding cannot by itself establish durable repair. Three markers would: a pleaded or admitted account of the root cause and the control that failed; tested failover evidence — demonstrations that the emergency call path survives a network change; and independent verification of remediation milestones rather than operator statements. Singtel's same-day confirmation of talks about selling part of its Optus stake (lightreading.com) underlines the point: ownership changes do not extinguish the record a court proceeding can fix.