Seems to be part of a group of recent numbers from an auto dialing charity telemarketer. Two other numbers are:- (02) 9003 4377 - (02) 9003 4351. I always wait thirty seconds before answering unidentified numbers on my mobile. Then I check them here on reverse. It seems to be a standard pattern. The thirty second rule seems to work best. After I give a one off disaster donation to a reputable charity. The telemarketer somehow winds up with my details. They seem to try from a set of different numbers. Never more than two or three times from each number. Non-response seems to be the best way to get rid of them. Just use the thirty second rule and half a dozen or so calls from various new numbers and then you wont hear from them again until your next one off donation.