Was at Bunnings last night and voice call worked but was cut down when I reached my place, I checked the phone, re-boot and so on to no avail. Issue seem to have started on the weekend but who knows as I don't use my mobile much at home. Anyone has the same problem in the Eschol Park 2558 NSW vicinity?
Have you restarted your phone by turning it completely off, wait a minute or so, and turning it back on again?
Is this in one location (Eschol Park 2558) or everywhere?
Have you checked the Service Status page for problems?
I just popped your post code https://www.optus.com.au/about/network/service-status into that website, one tower is currently undergoing maintenance (upgrades to support faster data). You can use the pencil on the right to report feedback.