The web porn filter praised by David Cameron recently is operated by Huawei, the Chinese telecommunications firm that politicians in the UK and US have voiced concerns about.
According to the BBC, UK-based employees of Huawei have the power to decide what websites are blocked by TalkTalk's Homesafe web filtering service.
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The firm is set to be investigated by the government over its UK Cyber Security Evaluation Centre following Parliament's Intelligence and Security Committee's investigation into foreign involvement in UK national infrastructure.
Speaking earlier this week, the Prime Minister praised TalkTalk's web filter, saying the firm had shown "great leadership" in setting up the voluntary service, which allows customers to block services including pornography, gambling and social media. The system is routed through a Huawei database.
The UK is set to controversially introduce default blocking of pornography by internet service providers (ISPs) unless users explicitly opt-in to viewing adult content. Cameron announced the policy on Monday in an effort to prevent the distribution of illegal pornographic material and stop adult content from "corroding childhood".
The policy has been criticised for being unworkable, while others have stated it should be the responsibility of parents, not the state, to determine what content children are viewing on the web.
Huawei is often subject to queries about its alleged involvement with the Chinese government and cyber espionage. The firm denies it's a security threat and has slammed suspicion about its activity as racist.
"This is tired nonsense we've been hearing for years, trotted out anew as a flimsy bright and shiny object to distract attention from the very real compromising of global networks and information that has been exposed in recent weeks," the firm recently said in a statement, following claims by an ex-CIO official that Huawei spies for the Chinese government.
However, a number of nation's have suspended Huawei contracts in recent years, while a US committee has deemed the firm as a "national security threat".
