RingCentral, a Redwood City, calif. company that allows small businesses to unify and manage their phone, mobile, fax and email communications, said it has raised a total of $12 million in a first round of financing.

Sequoia Capital and Khosla Ventures led the round. We mentioned their an initial $6.25 million investment back in January, which is included in the $12 million. This company was founded in 1999 .

RingCentral says it has 40,000 paying customers, and is signing up thousands more each month.


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