RingCentral, which provides cloud-based phone systems to small businesses, filed on Monday with the SEC to raise up to $100 million in an initial public offering. The San Mateo, CA-based company, which was founded in 1999 and booked $136 million in sales for the 12 months ended June 30, 2013, plans to list under the symbol RNG, but has yet to announce an exchange. RingCentral initially filed confidentially on June 24, 2013. Goldman Sachs, J.P. Morgan and BofA Merrill Lynch are the joint bookrunners on the deal. No pricing terms were disclosed.