Telstra says the outage that stopped 604 calls from accessing triple-0 services could have been avoided, blaming the lack of a software update on their timekeeping system and an undocumented design change.

In a submission lodged hours before Friday’s Senate hearing, Telstra says a software update was never applied to the device that triggered the outage.

In a submission lodged hours before Friday’s Senate hearing, Telstra says a software update was never applied to the device that triggered the outage.