Called 8pm & didn't leave message. There's been a barrage of such calls from unknown numbers lately, so I blocked it.

If you don't make a noise it hangs up. Calls repeatedly

Just missed answering phone call from this number at 9.57 PM Sydney time on 5th October (2017). Phone calls that late at night are usually urgent calls from family or friends, not from telemarketers, so I called back immediately though I didn't recognise the number.

Result = Telstra message "Call could not be completed".

Grateful to you for showing this was indeed a telemarketer with rather poor judgement about reasonable time to call.

Consistent calls from this number and doesn't leave a voice mail message so clearly a SPAM calling using auto dialler.
Will be reporting to Telco ombudsman as we're on the DNC list.