This section introduces voice traffic engineering. Voice traffic engineering is the science of selecting the correct number of lines and the proper types of service to accommodate users. From trunks and DSPs to WAN and campus components, detailed capacity planning of all network resources should be considered to minimize degraded voice service in integrated networks.
The bandwidth requirements for voice traffic depend on many factors, including the number of simultaneous voice calls, grade of service required, codec and compression techniques used, signaling protocol used, and network topology. The following sections introduce how to calculate the WAN bandwidth required to support a number of voice calls with a given probability that the call will go through.
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