The cross-party Inquiry, set up with the support of the Government last year, called for a formal consultation on compulsory pornography filters, which would be turned on by default.
“Forcing ISPs to filter adult content at the network level, which users would then have to opt out of, is neither the most effective nor most appropriate way to prevent access to inappropriate material online,” said Mr Lansman
“It is easy to circumvent, reduces the degree of active interest and parental mediation and has clear implications for freedom of speech. Instead parents should choose how they restrict access to content, be it on the device or network level with the tools provided.”
"Government should concentrate on helping educate consumers to ensure they know about the tools already available to them to restrict unwanted content."
But David Cameron gave qualified support to the proposals at Prime Minister’s Questions on Wednesday.
Mr Cameron said online child protection was a "very important subject" and that he encouraged working with internet service providers "to deliver these systems". He promised to look into the inquiry's report, which said that internet providers were not going far enough to block inappropriate material.
Last night the Culture Secretary, Jeremy Hunt said the government was “very clear that more must be done to protection children from harmful content” and that new legal powers would be considered.
Claire Perry, the Conservative MP for Devizes who led the Inquiry, said the Prime Minister was “extremely interested” in its conclusions and that it felt “like pushing an open door”. She added, however, that making filters compulsory had raised some concern at Number 10.
Mr Cameron’s intervention came as the internet provider TalkTalk announced plans to force its four million customers to make an "active choice" whether to block pornography or not. The firm has invested millions in a system that blocks access to adult websites.
It says it is currently the only provider to ask all new customers if they want to install parental controls, a measure recommended by Number 10 last year. One in three new have signed up block pornography since the option was introduced last month.
Mr Cameron has previously advocated a clampdown on the sexualisation of children.
Following the publication of a report by the childhood tsar Reg Bailey last year he said he wanted to "put the brakes on an unthinking drift towards ever greater commercialisation and sexualisation".
