Singtel has said that while Optus experienced an outage after its software upgrade, the upgrade itself was not the cause. "Singtel will support Optus as it learns from what has occurred and continues to improve," the Singapore company said a day earlier. Kanagaratnam told the hearing Optus never expected a total shutdown because it had filters designed to stop all 90 of the company's routers from being overloaded with data. "The outage was a result of our defence not working as it should have," he said. Bayer Rosmarin said 228 calls to Australian emergency hotline Triple-0 failed to connect because of the outage, but the telco had followed up all incidents and "thankfully everybody is OK".

---

Persons: Kanagaratnam, Singtel, Kelly Bayer Rosmarin, Bayer Rosmarin, telco, Byron Kaye, Gerry Doyle Organizations: SYDNEY, Optus, Singapore Telecommunications, Triple, Bayer, Thomson Locations: Singapore