VFRADVoice Over Frame Relay Access Device
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The need for reasonable end-to-end delay and moderate jitter requires that VFRADs segment much of the data traffic passing through.
The sound quality of VFRADs differ markedly, much like that of stereo equipment.
Common VFRADs have compression delays that range from 15 to 20 milliseconds.
* Jitter buffers -- Mandatory in VFRADs, these allow the voice to sound smooth and coherent.