The IEEE article said no such thing if one parses it correctly.
Quote:
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Comcast Corp., in Philadelphia, the country's largest cable company, is already a Narus customer; Thomas declined to say whether Comcast uses the VoIP-blocking capabilities.
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This quote tells you they were already a customer of Narus, "a company focused on telecommunications billing and customer market intelligence" (Wiki). But it doesn't say they bought the VoIP blocking product, if one parses it correctly.
VoIP-blocking was not a major product for Narus. It's just something they thought there might be a need for. There wasn't. The company died. VoIP blocking doesn't even make their Wikipedia entry.