Calls are not getting through to the Triple 0 emergency service lines in Australia's capital cities after a Telstra cable was cut in NSW overnight.
The outage mostly affected NSW but there were some interruptions in Victoria, South Australia and WA.
The fire causing the damage is believed to have been started by a lightning strike.
They said they are working to restore services as soon as possible, but WA is now still experiencing some interruptions.
"We are deeply sorry for the interruptions".
Emergency calls in three states are facing "intermittent interruptions" as a result of the breakage.
If any customers are still experiencing issues with their service we encourage them to contact a Telstra customer service representative.
People facing emergencies are being told to call the Police Assistance Line - 131 444 - if they can't get through on triple-zero.
A spokeswoman for the Australian Communications and Media Authority, which regulates and monitors carriage service providers and the emergency call service for triple zero, said it was working with Telstra to fix the problem. Queensland has been unaffected.
South Australia is now receiving emergency calls without issue.
But businesses and customers alike have since taken to Twitter to share their frustration after some of the nation's biggest banks, who use Telstra as a supplier, were also impacted. "This is due to network issues with our supplier", the bank tweeted.
It comes as the second outage this week for the telco.
"The issue was caused by technical changes made ahead of upgrades to mobile traffic control equipment in Telstra's Exhibition Street exchange in Melbourne".