This incident has been resolved.

We have identified the cause of the issue and a temporary workaround has been put in place to restore service stability whilst we continue to work on resolving the issue with our upstream carrier.

We are looking into a reported service disruption with SIP Voice Services in the Bendigo and Ballarat areas that may cause service disruptions and are currently investigating the cause of this.
Updates will be provided to subscribed contacts as soon as they are available.