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Bandwidth Requirements for Several Common VoIP Compression Algorithms
Codec Codec Bit Rate (Kbps) Nominal Ethernet Bandwidth (Kbps)
G.711 64 87.2
G.729 8 31.2
G.723.1 6.4 21.9
GSM 13.2 29.2
iLBC 13.3 27.7
G.723.1 5.3 20.8
G.726 32 55.2
G.726 24 47.2
G.728 16 31.5

NOTE: VoIP codecs require the listed amount of bandwidth upstream and downstream

NOTE2: If you have enough bandwidth, but you experience low voice quality make sure:

  • Your local internet connection is not congested by a large file download
  • Your SIP phone is configured to use codec G729 as priority one

    more information about codecs

    link to a more detailed free bandwidth meter (non java as the one above)

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