The communication industry has spent considerable effort in designing the IP-based media exchange mechanism, voice over IP (VoIP), which can deliver voice-band telephony with an acceptable quality. The Internet offers phone services that are less expensive and that have numerous additional features such as videoconferencing, online directory services, and Web incorporation. Multimedia networking is another innovative development in the Internet. With multimedia networking, the Internet can be used to transport phone calls, audio, and video content distribution. This chapter highlights the following topics:
• Public Switched Telephone Network (PSTN)
• Overview of voice over IP (VoIP)
• H.323 protocol ...