Summary

The proceeding that has not yet moved

On 30 July 2026 the Australian Communications and Media Authority commenced proceedings in the Federal Court against Optus Mobile Pty Limited over the 18 September 2025 outage, alleging that two obligations — giving end-users access to the emergency call service, and carrying emergency calls to the relevant termination point — were breached on 1,005 occasions during the event. ACMA seeks declarations of contravention and pecuniary penalties; the statutory maximum is 250,000 dollars per contravention. The regulator has said it will not comment further while the matter is before the court. https://www.acma.gov.au/articles/2026-07/acma-takes-optus-mobile-court-over-september-2025-triple-zero-outage

The respondent's own disclosure, filed through SGX by Optus Finance Pty Limited, confirms the date and the 1,005-occasion count, states that Optus is reviewing the pleadings and will respond in due course, and adds a pointed caveat: the company says it cannot determine the quantum of any potential penalties, which it notes are ultimately for the Federal Court and "not necessarily a direct calculation based on the number of contraventions." The announcement also fixes the corporate structure: Optus Finance and Optus Mobile are wholly-owned subsidiaries of Singtel Optus Pty Limited. https://cdn1.singteldigital.com/content/dam/singtel/investorRelations/stockExchange/2026/SGX%20ann_Optus_30072026.pdf

That is the entire procedural record. No sourced document shows a directions hearing, a defence filing, an agreed statement of facts, or any consent order after 30 July 2026. The ministerial statement welcoming the action repeats the allegation counts and likewise defers all further comment to the court. https://minister.infrastructure.gov.au/wells/media-release/statement-2025-optus-triple-zero-service-outage-court-proceedings-launched Secondary coverage extrapolated a potential exposure above 250 million dollars by multiplying the per-contravention ceiling across all counts — a figure the respondent's own announcement explicitly cautions against treating as a penalty calculation. https://www.itnews.com.au/news/optus-13-hour-outage-in-2025-lands-it-back-in-court-627793 https://cdn1.singteldigital.com/content/dam/singtel/investorRelations/stockExchange/2026/SGX%20ann_Optus_30072026.pdf

Where the durable-control evidence actually lives

The enforcement action is not the only instrument moving. The Triple Zero Custodian's requests register — last updated 15 July 2026, before the court filing — records a sequence of ECS Directions issued to Optus Mobile under the new statutory framework: a 14 November 2025 direction requiring information on outage-response policies and procedures, including notification, welfare checks and recovery, plus testing performed before system changes (information received 1 December 2025, status closed); a 29 April 2026 direction covering twelve months of historical emergency-call performance metrics across Optus Mobile, Telstra and TPG (received 14 May 2026, closed); and a further metrics direction for May and June 2026, issued 15 July 2026, still open. https://www.infrastructure.gov.au/media-communications/phone/triple-zero-custodian/custodian-requests-register

The Custodian's progress report to 31 January 2026 adds institutional machinery: the National Telecommunications Resilience Centre, built with the University of Technology Sydney, began its first mobile device-testing campaign on 5 November 2025, runs biannually, and scheduled a second campaign for May 2026. The same report records the Custodian's November 2025 letter to ACMA setting six priorities, among them network testing and welfare-check procedures. https://www.infrastructure.gov.au/sites/default/files/documents/triple-zero-custodian-progress-report-march-2025-to-31-january-2026.pdf The department's Senate submission of 24 November 2025 grounds this in statute: ACMA may issue an ECS Direction requiring information about the installation, operation, maintenance or testing of equipment and software. https://www.department.infrastructure.gov.au/sites/default/files/documents/departments-submission-to-the-triple-zero-service-outage-senate-inquiry-24-november-2025.pdf

ACMA's own quarterly report for October–December 2025 ties the oversight record back to the first outage: it registered the Emergency Calling Network and Mobile Phone Testing Industry Code C674:2025, and states that this registration implemented recommendations 3, 4 and 16 of the Bean Report — the independent review into the November 2023 outage. The same quarter saw three new investigations opened into other carriers' emergency-call compliance. https://www.acma.gov.au/publications/2026-03/report/action-telco-consumer-protections-october-december-2025

What remains only the company's word

Dr Kerry Schott's independent review, released by the Optus Board on 19 December 2025 and dated 12 December 2025, made 21 recommendations. It found the prior testing regime insufficient to detect the device behaviour seen on 18 September, recorded that the emergency-call timing setting had been changed from 10 seconds to 600 seconds after the incident, and recommended six-monthly end-to-end Triple Zero testing with deficiencies reported to ACMA alongside a remedial plan. https://regmedia.co.uk/2025/12/19/supplied_independent_report_triple_zero_outage_at_optus_18_september_2025.pdf The Optus Board accepted all recommendations at its 16 December 2025 meeting and announced an implementation work program. https://www.optus.com.au/about/media-centre/media-releases/2025/12/dr-schotts-independent-review

That acceptance is the weakest link in the durability chain. It is a self-reported commitment, not a verified state. The Schott report itself notes that some items fall to carriers and government jointly under the Custodian, and no sourced document independently confirms completion of the recommendations. The reporting on the review — that 75 percent of Triple Zero calls failed from 605 attempts during an outage of almost fourteen hours linked to two deaths, and that the call centre failed to escalate warnings from five callers — describes findings, not fixed controls. https://www.abc.net.au/news/2026-07-30/acma-takes-optus-to-federal-court-over-2025-outage/106975412 https://www.techguide.com.au/news/mobiles-news/optus-triple-zero-outage-report-reveals-internal-company-failures-and-emergency-calling-system-faults/

The entity in the ledger

Optus Internet Pty Ltd carries twelve of the 2,145 failed emergency calls from the November 2023 outage in ACMA's concluded apportionment, a ledger BTW has already traced in prior coverage of this entity. The September 2025 proceeding does not name it; Optus Mobile Pty Limited is the respondent. Yet the entity remains the unit through which the group's regulatory accounting is read, and the directory record maintained for it — Optus Internet Pty Ltd — is where the next apportionment, if one comes, would land.

The honest position as of this writing: the courtroom is quiet, the Custodian's directions are the only externally administered control actively running against the group's mobile entity, and the remediation program rests on the company's own attestation. Which of those three proves decisive will only be visible when either the court record moves or the next outage does not happen.

Sources