Chapter 28. Voice Over Internet Protocol
Voice over Internet Protocol (VoIP) is a technology to use the Internet Protocol instead of phone-switching technology for voice, facsimile, and message services. The typical consumer probably hasn't heard of VoIP yet. However, the technology is already commonly in use. The main example would be the dominance of inexpensive prepaid telephone cards on the market. VoIP is the technology in use for almost all the prepaid telephone long-distance cards. It's how their per-minute charges are so competitive, compared with traditional long-distance service.
Until just a few years ago, every telephone call utilized the traditional Public Switched Telephone Network (PSTN). With PSTN, a long-distance call first ...
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