Telstra Corporation has avoided a fine for breaching privacy rules in 2011.
Instead, the Australian Communications and Media Authority today ordered Telstra to comply with the new Telecommunications Consumer Protection Code's privacy clause.
In June, ACMA found Telstra failed to protect the personal details of 734,000 customers, whose addresses, drivers licence numbers and dates of birth were publicly accessible between March and December 2011.
The information was accessible via a web-based customer management tool and made accessible via a link available on the internet, ACMA said.
"Given Telstra has pro-actively taken steps to remedy its processes with a view to preventing such an incident from happening again, a direction with respect to the specific code provision is the appropriate measure," ACMA chairman Chris Chapman said in a statement.
At 9.56am, Telstra was up one cent at $3.96.