Dheeraj Gupta and Manpreet Singh - Gulati-Aricent, Gurgaon, Haryana.
The Internet has shown tremendous growth and continuous evolution in order to accommodate multimedia services including both voice and video applications. In particular, Internet telephony, or voice over IP is one of the most promising services currently being deployed. The Voice over IP (VoIP) significantly reduces long distance telephone charges by transferring all the longdistance voice and data over Internet connection. Besides the potentially significant cost reduction, Internet telephony offers many new features and easier integration with widely accepted Web- based services. Since VoIP shares the Internet connection with other forms of traffic, it must compete with other applications for voice quality. There still exists a number
of barriers to the widespread deployment of Internet telephony. One of the key challenges in implementing VoIP is to design and build an IP-based network that meets stringent QOS requirements. In order to deliver the high QOS that users demand, VoIP system designers must tackle various parameters specific to Packet network.