Telstra CEO Vicki Brady came back from leave on July 9 as the company struggled with a nationwide network outage.
The failure blocked Triple Zero emergency calls and upended transport systems.
Brady offered a public apology and said investigations are underway to find the cause.
The outage has produced transport delays nationwide.
Media and regulators are monitoring her response and upcoming steps.
The incident set off a cascade of failures in Telstra’s core network, resulting in loss of voice and data services for millions of customers.
Emergency responders cited trouble reaching callers.
Government officials insisted on a full report.
Brady promised to reinforce systems and rebuild trust.