RingCentral is a unified-communication-as-a-service, or UCaaS, provider. Its Internet-enabled cloud products are replacing on-premises private branch exchanges, which support voice-only desktop phones. In contrast, RingCentral's software provides an easy-to-use, integrated communication application that allows for a single user experience across mobile and desktop applications. The software lets businesses communicate and collaborate using voice, video, text, Internet messaging, and conferences capabilities all in one place. Ninety percent of RingCentral's revenue comes from its RingCentral Office application, which is available in four tiers based on integration needs and the number of employees. The company was founded in 1999 and is headquartered in Belmont, California.