This number came up with the location of Clarence Town, NSW. I'd never heard of this place but a quick Google Maps search revealed it isn't too far from Newcastle. I didn't answer the phone and further investigation revealed it was previously associated with Redback Communications and is actually a landline number. The information I found out suggests that this is a number spoofed by scammers trying to trick me to answering the phone.

Unless you've actually called this number yourself or visited the company, my advice is to not answer it and treat it like a scam call.