scam/spam caller checking to see if phone line is answering for indian based call centre - we are on the "do not call" register, but getting 4-5 calls a day from 'overseas' private number, (03) 8306 5202, (03) 9940 2000,'overseas' 5166730621, etc rotating through every 1-2 hours, phone ringer turned off so dont actually hear it but check every day - same numbers, everyday.

Shows as 'overseas' when called missed but is '03' number.
Exactly what Tony said in May 21 post
Like Janine also said you answer, hear nothing then THEY hang up?!

rings once a week and hangs up when i answer

Got a call from this number twice in the past two days. They hang as soon as I answer.

University of Sydney "health and work survey"

a company i dont know and i dont want to talk to - unity 4?!

phone rang and when I answered it was silent for twenty seconds and then hung up. weird