Voice over IP (VoIP) technology allows telephone calls to be made over digital computer networks including the Internet. VoIP converts analog voice signals into digital data packets and supports real-time, two-way transmission of conversations using Internet Protocol (IP). The terms Internet telephony, broadband telephony, and broadband phone service specifically refer to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN). VoIP also refers to voice calls that are routed over online,the IP that serves as the backbone of the Internet and is used to ferry e-mails, instant messages and Web pages to millions of PCs or Cell phones.