Optus has expanded an internal triple-zero routing review to cover regional Victoria after a hardware failure at a state exchange left voice customers—including emergency callers—without reliable service for more than an hour in mid-September, according to people briefed on the program and statements from Triple Zero Victoria. The telco told regulators it is re-testing camp-on hand-offs and inactivity timers that were central to last year’s national outage, when hundreds of callers could not reach emergency operators.

What broke in Victoria

On 11 September, Optus said a component fault at a Victorian exchange disrupted voice calling for about 75 minutes across parts of Victoria, South Australia, Tasmania and the Northern Territory. Triple Zero Victoria’s chief operations officer Paul Santamaria said Optus referred roughly 40 calls that experienced difficulty connecting to Telstra’s national triple-zero operator; Victoria Police liaison officers in communications centres then conducted welfare checks. Police later said about 40 checks were completed with no adverse outcomes reported.

Optus attributed the incident to unspecified hardware that has since been replaced. Industry publication iTnews reported the failure originated at a Victorian exchange and that around 190,000 customers experienced two call attempts that did not reach the intended recipient during the window. The episode is separate from the September 2025 nationwide triple-zero failure that lasted roughly 14 hours in several states and territories, but it lands in the same policy debate about how quickly mobile devices retry emergency calls when a primary carrier’s voice path fails.

Why routing reviews matter now

Dr Kerry Schott’s independent review of the 2025 outage found that camp-on—routing emergency calls across any available mobile network—can take 40 to 60 seconds in some device and network combinations, long enough that callers hang up believing the call failed. Optus had shortened an emergency inactivity timer to 10 seconds to address Pixel handset behaviour; the review noted other carriers used timeouts between 150 and 600 seconds. Optus has since reverted toward longer timers, but Victorian regional sites with weaker multi-carrier coverage remain a focus for engineers validating settings field by field.

Communications Minister Michelle Rowland’s office has kept pressure on carriers after the 2025 deaths linked to unconnected triple-zero attempts. Optus board materials cited by the Schott report acknowledged that recommendations from an earlier Bean review had been implemented, while noting room to exceed minimum regulatory testing. Kearney, engaged to track Bean follow-through, agreed implementations were in place but pointed to benefits from more automated end-to-end testing without clogging live emergency lines.

Regional Victoria on the checklist

People familiar with the expanded review said teams are prioritising exchanges that serve highways between Melbourne, Ballarat and the Murray corridor, where dropped voice calls strand motorists before they can retry on another network. Optus has not published a map of affected cells; Triple Zero Victoria said its operations centre monitored the September event in real time and escalated through established carrier liaison channels.

Local councils and ambulance services in Gippsland and the Mallee have asked for clearer public messaging when voice fails but data still works—an increasingly common pattern when only circuit-switched voice paths break. Optus encouraged customers to try SMS to triple zero only where voice is impossible, echoing national advice that voice remains the default emergency channel when available.

Regulatory and political context

The Australian Communications and Media Authority continues post-outage compliance work, and a Senate inquiry has examined triple-zero resilience across the industry. Optus faces civil litigation tied to the 2025 failure; the Victorian hardware incident is unlikely to trigger the same scale of inquiry but feeds affidavits about whether camp-on performs as consumers expect during partial failures.

Competitors Telstra and TPG have highlighted their own testing regimes in submissions without naming Optus directly. Victorian Premier Daniel Andrews’s successor government has largely left carriage to federal communications portfolios, but state emergency services ministers receive quarterly resilience briefings that now include mobile routing metrics.

What Optus says it will deliver

An Optus spokesperson said the company identified the September hardware issue within minutes via network monitoring, mobilised technical teams, and engaged stakeholders including Triple Zero Victoria. The expanded routing review will document timer settings, device-specific retry behaviour, and exchange-level failover paths, with summaries shared with the ACMA under existing incident-reporting rules.

For households along the Hume and Calder highways, the practical test is whether a second triple-zero attempt routes faster than the first when one carrier’s voice gateway is impaired. Until Optus publishes Victorian results, emergency services organisations advise callers to stay on the line if a call appears to stall, because camp-on may still be working even when handsets show no immediate audio.

Near-term checkpoints

Triple Zero Victoria will track whether referred-call volumes spike during summer storm season, when mobile networks face power and backhaul stress. Optus investors, meanwhile, watch whether recurring voice incidents affect churn in regional prepaid markets. The routing review’s Victorian chapter is due internally before the end of the quarter; regulators have not set a public release date, but any repeat welfare-check batch in single digits will still make headlines long before board packs circulate.