CONFIGURATION OPTIONS
We have discussed the issues surrounding VoIP. Let us now look at some VoIP configurations and topologies. Several configuration options are available to support VoIP operations. Figure 1-3 shows five examples. In Figure 1-3(a), conventional telephones are employed as well as the telephone network (you may have noticed that the term telco is used in this book as a shorthand notation for the telephone network). The VoIP gateway provides the translation functions for the voice/data conversions. On the transmit side, the gateway uses a low-bit rate voice coder and other special hardware and software to code, compress, and encapsulate the voice traffic into data packets (IP datagrams). It accepts conventional telco traffic ...
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