This incident has been resolved.

A fix has been made and inbound calls are now connecting.
We will continue to monitor and provide details on what happened once we have one.

We have had confirmation from Vocus that some voice services are currently unavailable.
We will keep you update once we know more, but information can also be fond on their website http://status.vocus.com.au/

We have identified an issues with our upstream carrier Vocus, they are currently having a major incident with their Meira platform.
From our testing it's only affecting NSW numbers.