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Online! The Book by Wendy Taylor, Chris Pirillo, John C. Dvorak

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The Special Requirements of Voice

Though voice is just another data application in an IP system, it nevertheless has some distinct requirements. Some unique characteristics set voice apart. These include all of the following:

  • Voice is a real-time application. This means data packets must be processed as they happen in the real world. They do not have the same tolerance for delay and packet loss as other data applications.

  • Data traffic sometimes happens at unpredictable intervals, or “bursts.” Voice, on the other hand, follows a consistent flow and is more predictable.

  • Data transmissions are generally “asymmetrical” because file transfers are typically much larger on the download side than they are on the upload side. Conversely, voice transmissions ...

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