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VOIP in a Nutshell

SIP Protocol Stack
protocol_stack

VOIP Codec Comparison

Codec Data Rate Typical Datagram Size Packetization Delay
G.711u 64.0 kbps 20 ms 1.0 ms
G.711a 64.0 kbps 20 ms 1.0 ms
G.726-32 32.0 kbps 20 ms 1.0 ms
G.729 8.0 kbps 20 ms 25 ms
G.723.1 6.3 kbps 30 ms 67.5 ms