No message left- blocked

Did not recognize number, did not answer, no message left. Rang number, recorded message " Optus advises the mobile number you have called has been disconnected ". Scam, blocked.

Another ringing phony. 6 rings hangs up, never a message left, when I searched the number in the white pages & yellow pages, there is no legal or registered user.
I dont know the number. Its not one from my contacts list & I havent made any inquiries to anyone that would require a return call.
So in my opinion its a scammers number that they send through a computer VOIP router so you cant tell if its a real contact or not. Block it delete it & do not answer it. Report it to Scamwatch Australia.

No message, suspect scammer