 Unlike circuit switching, no path is saved for the duration of the voice session. However, voice packets can be prioritized. VoLTE (Voice over LTE) A 3rd Generation Partnership Program protocol used to carry packetized voice (VoIP) on LTE networks. VPN (Virtual Private Network) Provides the functions and features of a private network without the need for dedicated private lines between corporate sites or between corporate sites and remote users. Each site connects to the network provider's network rather than directly to another corporate location. VRU (Voice Response Unit) Provides information to callers based on their touch-tone or spoken commands. VRUs query computers for responses and "speak" them to callers. For example, people often can call their bank or credit card company to find out their balance or to learn if a payment has been received. WAN (Wide Area Network) Connects computers located in different cities, states, and countries. WAP (Wireless Application Protocol) A protocol that defines how Internet sites can be displayed to fit on the screens of cellular devices and how devices access and view these sites. WCDMA (Wideband Code-Division Multiplexing) The 3G service that most GSM operators install. WDM (Wavelength-Division Multiplexing) www.TechnicalPDF.com Also known as dense wavelength division multiplexing, this enables multiple colors or frequencies of light to be carried on single pairs of fiber. WDM greatly increases the capacity of network providers' fiber-optic networks. WebRTC (Real-Time Communications) A set of IEEE and World Wide Web Consortiums (W3C) protocols for embedding software based codecs in applications and browsers for real time voice, video, and chat among disparate devices and operating systems. Wi-Fi (Wireless Fidelity) Wireless networks based on 802.11 IEEE standards. The Wi-Fi Alliance tests and certifies that products meet IEEE 802.11 standards. WiMAX (Worldwide Interoperability for Microwave Access) A forum whose goal is to facilitate interoperability of equipment based 