Internode, the internet service provider, says that it will not join the Australian government's efforts to install a child pornography filter. The refusal, which deals a blow to hopes that the measure would be an industry standard, was based on Internode's concerns about the administration of the blacklist of child porn Web sites.

The Australian Communications and Media Authority maintains the list of child porn Web sites, which add web addresses obtained from lists maintained by reputable overseas agencies.

However, a blacklist maintained by the authority was leaked last year and was found to contain--in addition to the child abuse Web sites it was made to identify-- online poker sites, YouTube links, regular porn sites, and websites of fringe religions.

Stephen Conroy, the communication minister, earlier announced that the government would defer on the implementation the measures until the end of what is expected to be a year-long review of refused classification rules. In spite of the delay on the move, Telstra, Optus and Primus, which represents about 70 percent of Internet connections in the country, have agreed voluntarily to block child abuse Web sites.