Updated Jul 30, 2026 – 3.53pm, first published at 1.22pmSingaporean-owned telco group Optus is being sued by its regulator in court over its fatal Triple Zero outage in September 2025, exposing it to potential fines of up to $502 million.The lawsuit, filed by the Australian Communications and Media Authority in the Federal Court, alleges that Optus breached two sections of the law more than 1000 times each when 605 emergency calls on its network failed last year.Subscribe to gift this articleGift 5 articles to anyone you choose each month when you subscribe.Subscribe nowAlready a subscriber? Fetching latest articles