Bandwidth Calculations for QOS Codecs

It is 16 Kbps for a G729 packet and 64 Kbps for G711. With overhead it’s 26.4 Kbps for G729 and 92 Kbps for G711 – which should be used for your calculations.

G729 = 26.4 Kbps
G711 = 92 Kbps

Keep in mind this is estimated to help get a good calculation for the mount of QoS EF traffic that needs to be configured.

For example, a phone system using G729 with 500 phones:
500 x 26.4 Kbps = 13,200 Kbps
13,200 Kbps = 13.2 Mb/s

So based on the information above, you’d make sure you have dedicated 13.2 Mb/s to EF traffic in your QOS Config.

For example, a phone system using G729 with 500 phones:
500 x 92 Kbps = 46,000 Kbps
46,000 Kbps = 46 Mb/s

So based on the information above, you’d make sure you have dedicated 46 Mb/s to EF traffic in your QOS Config.

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