Telstra CEO Vicki Brady publicly apologizes for a technical fault causing triple-0 service outage, affecting over 100 callers.

The outage was due to a backup process error and a communication glitch, preventing 127 emergency calls from connecting.

A manual error in entering an email address further delayed response to some emergency calls.

Telstra is implementing a software update to correct the fault in their calling line identification systems by early April.

The CEO assures the public that improvements have been made to ensure the reliability of triple-0 services.

The Australian Communications and Media Authority is investigating Telstra's compliance as the Emergency Call Service provider.

Concerns are raised about the impact of the upcoming 3G network switch-off on the ability to dial triple zero from nearly 1 million phones.

Optus is also under investigation for compliance with triple-zero service regulations following system failures.