Telstra has restored all call services after an outage caused by a fire at a northern Sydney exchange that affected customers across Australia.
The fire at the Chatswood exchange damaged power infrastructure and left some customers disconnected for more than two hours.
While calls have been restored, the telco said it was still experiencing issues with SMS.
"As a result of the Chatswood exchange fire today it's possible some SMS messages have been incorrectly delivered," a Telstra spokesman said.
"Customers won't be receiving SMS messages in the short term while we resolve this issue."
The outage had widespread consequences, with nine Jetstar flights delayed for 45 minutes due to disruptions to check-in ports, and NAB warning its online customers of delays to SMS alerts.
A spokeswoman from Jetstar said it was working with airport teams and Telstra to get systems up and running.
"We are working through a bit of a backlog now but it is almost back on track," she said.
Telstra has been hit by eight outages in 12 months, and this week retained its ranking as Australia's most valuable brand in a global survey.
