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Bandwidth consumption depends on which codec is used for conversation. Normal conversation includes a lot of silence which means that full bandwidth is not used all the time. Also, each codec stream can result in a larger bandwidth due to IP and UDP headers and overheads. The following data displays the bandwidth usage with and without the UDP/IP headers:
Codec Bit rate Total Used Bandwidth
G.711 64 Kbps 87.2 Kbps
G.729 8 Kbps 31.2 Kbps
G.723.1 6.4 Kbps 21.9 Kbps
G.723.1 5.3 Kbps 20.8 Kbps
G.726 32 Kbps 55.2 Kbps
G.726 24 Kbps 47.2 Kbps
G.728 16 Kbps 31.5 Kbps
iLBC 15 Kbps 27.7 Kbps
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