Phone services

Headquartered in San Mateo, Calif, RingCentral is the leader in the rapidly growing market for next-generation telecommunications services. Tens of thousands of busy professionals and growing businesses rely on RingCentral Online for their phone and fax solutions. It effectively integrates PSTN, VoIP, cellular, email, voicemail, fax, SMS and the Internet into a comprehensive package that radically improves productivity for business subscribers and their callers alike. The company also also offers eXtremeFax Internet fax service, as well as BuzMe and Pagoo Internet call waiting services.

http://www.ringcentral.com/company.asp