VoIP bandwidth

With default payload size = 20 bytes
G.729 call = (40 bytes of IP/UDP/RTP headers + 20 bytes payload)* 8 bits/byte * 50pps = 24Kbps per VoIP call

With payload size = 40 bytes
G.729 call = (40 bytes of IP/UDP/RTP headers + 40 bytes payload) * 8 bits/byte * 25pps = 16Kbps per VoIP call

http://xs225.xs.to/xs225/08131/presentation2318.gif

Reference
Voice Over IP - Per Call Bandwidth Consumption

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