Spying may be accomplished through the software code and telecommunication equipment manufactured by two large Chinese firms.

FORBES: Congress, Espionage And Chinese Chips

The telecommunication equipment maker's fiscal second-quarter profit fell 82% as sales stagnated and the company also forecast weaker adjusted profits for this quarter.

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The clear message from the 52-page report written in polite and politically correct language, perhaps not to alienate China, is that two major Chinese telecommunication equipment companies, Huawei and ZTE, may be facilitating spying on western interests.

FORBES: Congress, Espionage And Chinese Chips

The list covers six product categories software, computer and application devices, telecommunication products, new energy and equipment, highly energy-efficient products, and modern office equipment but is expected to be expanded, according to the Business Software Alliance.

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Huawei spokesperson William Plummer said the company's equipment was used by 90% of the top 50 telecommunication service providers globally and that there had been "zero security incidents" with any of them.

BBC: Huawei products