Must be a scam. I get a not connected signal when I try to call back.

Scam, directs to a voicemail saying the number is not connected.

Answered and (australian sounding)woman started on a long spiel, something about saving rainforests, she went on long enough for me to look up here, found the stories and put her on mute, she continued on for about 3-4 minutes and then asked if I'm "interested in supporting something like this"
Which is the real good catch phrase,
This has happened to me before, at that time I answered "probably", after which I was bombarded with every possible type of "charity" call possible for months,
It's the call centres way of getting your permission for them to call you anytime(BTW this call came in at 8.20 am sat morning).
So I know better now, I left her on mute till she went away, after which I tried to call her number back, guess what---Disconnected number(stated so by an american voice).
So I have blocked the number she rang from and JIC labeled her number range as "scammer" in my phones call index, so I know not to answer it next time.

I rang back the number (07) 3101 8567 once but got disconnected