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Telstra CEO Vicki Brady told a Senate inquiry on Friday that last week's outage at Australia's largest telecoms firm was likely caused ​by an undocumented design change and a missed software update ‌on a network time-keeping device.

Returning from annual leave, Telstra chief executive Vicki Brady has faced a barrage of questions for the first time since the company's nationwide outage on Wednesday affected train services, payment systems and triple zero calls. Brady says the failure was not the result of job restructuring, insisting that 'people and processes worked as they should have'.

An outage hit services of ​Australia's biggest telecommunications company Telstra on Wednesday, ‌disrupting taxi payment systems and some train services, with the government saying the issue affected "a large ​number of mobile calls and connections."