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Bandwidth Usage in VOIP

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Summary This article describes the bandwidth usage in VOIP.
Applies to askiavoice
Written for IT; Network Administrator
Keywords VOIP;Bandwidth;

Every single VoIP call (agent-CTArchitect, supervisor-CTArchitect or CTArchitect-Phone network) requires a certain amount of bandwidth. The needed capacity mainly depends on 2 factors:

  • Chosen codec with compression (G.729) or not (G.711)
  • Voice activity detection (VAD)

The voice bandwidth usage would be as follows:

Codec Type Voice Activity detection Estimated bandwidth usage (per call)
G711 A-law Off 90 Kbps
G711 A-law On 55 Kbps
G729A Off 33 Kbps
G729AB On 24 Kbps
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