This is an unrecognised Sydney number that called my mobile in W.A. I didn't answer and no message was left. I called back and as usual, there was no dialling sound - just a few seconds silence and it clicked off with a mechanical sound. Obviously this number has been hijacked and used by scammers for their nefarious purposes.

About 3 hours before that another number from Vic did the same. That one is also logged here.