Specifications

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.
PSTN
Public Switched Telephone Network: This is defined as the regular telephone network services.
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).