Speaking at a joint committee hearing into cyber safety, Jennifer Duxbury, Compliance, Regulatory and Corporate Affairs Director at ninemsn, said the mandatory ISP-level filter would not aid cyber safety.

"The government's proposed response to the issue [of cyber safety] -- that is the mandatory filter -- our view would be that the decision was made very quickly and we believe it would be good to see the possibility of a voluntary program explored before we have to move to a regulatory response," she said.

According to Duxley, the experience of other countries, particularly the UK, had shown that a voluntary ISP filter can achieve positive results.

Yahoo!7 legal and policy director, Samantha York, also stressed the use of a voluntary ISP filter and noted the .