Thank you. Good afternoon and welcome to RingCentral's fourth quarter 2015 earnings conference call. I'm Darren Yip, RingCentral's Director of Investor Relations. Joining me today are Vlad Shmunis, Founder, Chairman and CEO; and Clyde Hosein, Chief Financial Officer. Our format today will include prepared remarks by Vlad and Clyde followed by Q&A. The primary purpose of today's call is to provide you with information regarding our performance for the fourth quarter 2015 along with our financial outlook for our first quarter and full-year 2016. Some of our discussions and responses to your questions may contain forward-looking statements including statements regarding our expected financial results for the first quarter and full-year 2016, our future plans, prospects and opportunities, trends in the business communications market, our expectations regarding our expansion internationally and up-market, our service provider and other reseller relationships, our integrated partnerships, open platform, the Glip and contact center product and our global office solution, our new phone distribution model, our plans to enhance our platform, further our enterprise capabilities and expand our international reach, and our growth strategies, current and future market position and expected growth. These statements are subject to risks and uncertainties. Actual results may differ materially from our forward-looking statements and projections for a variety of reasons, including but not limited to, general, economic and market conditions, the effects of competition and technological change; the success of our marketing, sales and retention efforts; and customer demand for our acceptance of our products and services. A discussion of the risks and uncertainties related to our business is contained in our filings with the Securities and Exchange Commission and is incorporated by reference into today's discussion. We disclaim any obligation to update information contained in our forward-looking statements whether as a result of new information, future events or otherwise. I encourage you to visit our Investor Relations Web site at ir.ringcentral.com to access our third quarter 2015 earnings press release and Slide presentation, our non-GAAP to GAAP reconciliation, our periodic SEC reports, a webcast replay of today's call and to learn more about RingCentral. With that, let me turn the call over to Vlad.