Missed call. Unknown caller. Similar pattern (time of day, quick termination of dialing) to recent calls from (02) 8705 3274, (02) 8404 0627, (02) 4602 6003.
[Repeat after me: - "I'm sorry I don't take charity, promotional or survey calls. Thank You. Goodbye!" CLUNK] (The three types of calls still permitted even if you're on the "Do Not Call" register)