In linguistics and grammar, a pronoun is a word that substitutes for a noun or noun phrase. It is a particular case of a pro-form.
IP Routing is an umbrella term for the set of protocols that determine the path that data follows in order to travel across multiple networks from its source to its destination. Data is routed from its source to its destination through a series of routers, and across multiple networks.
Voice over Internet Protocol (VoIP) Technology that allows voice to be carried over internet connections or other networks (which are not designed specifically to carry voice) using Internet Protocols (IP). Although comparatively inexpensive, this method (as yet) does not provide real full-duplex communications.