Telephony over IP (ToIP)
Telephony over IP (ToIP) refers to the transport of voice, video, text, and other real-time media overnetworks. IP Telephony is considered to be the key technology that will provide advances in communication for end users and is expected to completely replace the over time. This term is synonymous with , though some people like to say that "telephony" is more encompassing than "voice", meaning that "telephony" includes functionality beyond "voice".
Resources: IMC Information Site