This call showed as coming from Sydney, NSW. When I answered (a couple of times) there was a long silence, followed by a sudden short burst of sound which sounded like background noise of a call centre. The call was then terminated from the other end. I strongly suspect it was an attempted scam call of some sort.

Call was killed during the answering machine response.

Answered they just hang up

I answered this call on a couple of consecutive days, there was a long silence, then the call ended.