Telstra CEO Vicki Brady resumed duties after leave on July 9 as the company faced a nationwide network outage.
The failure suspended Triple Zero emergency calls and upended transport systems.
Brady gave a public apology and said investigations are underway to find the cause.
The outage has produced transport delays nationwide.
Media and regulators are observing her response and upcoming steps.
The incident caused a series of failures in Telstra’s core network, bringing about loss of voice and data services for millions of customers.
Emergency responders noted difficulty reaching callers.
Government officials requested a full report.
Brady committed to strengthen systems and rebuild trust.