Firewall upgrade linked to three deaths after Australian telco cut off emergency calls

Optus was unaware network changes caused a problem, and ignored some customer complaints

Australian telco Optus says its staff may not have followed established processes when a firewall upgrade they conducted resulted in customers not being able to call emergency services for 14 hours - a period during which it is thought three of the carrier's customers died after trying to seek help, according to the company's CEO....