Specifications

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Private Branch Exchange: An in-house telephone switching system that interconnects telephone
extensions to each other, as well as to the outside telephone network.
PROXY
A server that receives requests intended for another server and that acts on the behalf of the client
behalf (as the client proxy) to obtain the requested service. A proxy server is often used when the
client and the server are incompatible for direct connection. For example, the client is unable to meet
the security authentication requirements of the server but should be permitted some
SIP
Session Initiation Protocol: An application-layer control protocol, a Signaling protocol for Internet
Telephony. SIP can establish sessions for features such as audio/videoconferencing, interactive
gaming, and call forwarding to be deployed over IP networks thus enabling service providers to
integrate basic IP telephony services with Web, e-mail, and chat services. In addition to user
authentication, redirect and registration services, SIP Server supports traditional telephony features
such as personal mobility, time-of-day routing and call forwarding based on the geographical location
of the person being called.
VoIP
Voice over Internet Protocol. The technology used to transmit voice conversations over a data
network using the Internet Protocol. Such data network may be the Internet or a corporate Intranet.
WAN
Wide Area Network. A computer network that spans a relatively large geographical area. Typically, a
WAN consists of two or more local-area networks (LANs).