Chapter 2 Considering VoIP Design Elements
Voice over IP (VoIP) introduces additional challenges into a network design. Some of these challenges stem from the necessity of providing a perceptible level of voice quality to end users, while efficiently using available bandwidth.
VoIP design also requires additional processing components not necessary in traditional data networks. Specifically, coder/decoders (that is, codecs) convert the spoken voice into a data stream. Some codecs compress voice to consume less bandwidth. However, compressing voice can degrade the quality of the voice. The loss of voice quality could cause issues when sending tones (for example, Dual Tone Multifrequency [DTMF] tones, modem tones, and fax tones) across a network. ...
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