This is from Fierce VOIP The foundation of VoIP networks and VoIP technology is a set of protocols called H.323. These protocols were established by the Telecommunications Sector of the International Telecommunication Union (ITU-T). H.323 specifies components, protocols, and procedures for real-time point-to-point and multipoint multimedia communication over packet-based networks.
From Vonage Voice over Internet Protocol (VoIP) is a reliable technology for transmitting ordinary telephone calls over your internet connection using packet linked routes, also called IP Telephony . Internet Protocol involves the transmission of telephone calls over a data network like the Internet that can reach any telephone on