More than 10 million numbers have been listed on the government-run Do Not Call Register.
Businesses can potentially face fines of up to $340,000 a day for making telemarking calls and sending marketing faxes to numbers listed in the register.
The database of telephone numbers is administered by the Australian Communications and Media Authority. The Do Not Call Register was created in May 2007, after the federal parliament passed legislation in June a year earlier.
Since the launch, around 3600 numbers have been added to the register every day, according to ACMA.
"These results demonstrate that Australians view the register as a really practical and effective way of reducing unsolicited telemarketing calls and marketing faxes," ACMA's chairperson, Chris Chapman, said in a statement.
More than 7000 warnings to businesses have been issued by the ACMA.
‘It’s reassuring that an overwhelming majority of businesses making telemarketing calls do the right thing,’ said Mr Chapman. ‘But for those that don’t, the ACMA continues to take decisive action for unsolicited telemarketing calls and marketing faxes.’
Last year the government announced changes to the operation of the register to make number registration indefinite. Previously, numbers had to be re-registered every eight years.