Appears I'm getting the same, answer call and other end hangs up.

Register your number(s) on the Do Not Call Register found at www.donotcall.gov.au

As the home page says "Once your numbers are listed on the register, telemarketers and fax marketers must not contact you.
Some groups can still contact you after you register. These include registered charities, research companies, registered political parties and educational institutions." Check it out. Sanity saver!!

They constantly call both my land line and mobile and hang up when I answer.
Very tired of it as I can get 2 or 3 per day - its harassment!

Keep getting calls from this number however, when I answer, the caller hangs up.

Origin Solar just don't give up....I hate cold calling!