Brix Networks , which makes hardware and software for monitoring VoIP performance, last week said it has added $5 million in venture capital funding. The Chelmsford, Mass., company now has raised about $60 million over five rounds since its founding in 1999. New investor Castile Ventures, plus current backers such as Charles River Ventures and ComVentures, led the latest round. Brix says it plans to use the new funding to support sales, marketing and engineering efforts.
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