There is a simple equation that relates codec speed and the delay between packets to the datagram payload size. The datagram payload size is calculated by the following equation.
packet delay (in milliseconds) x Codec speed (in kilobits/second) (8 bits/byte)
The total packet size, excluding the transport header, is calculated using the following equation.
Datagram Payload Size (in bytes) + 12 bytes (RTP Header) + 8 bytes (UDP Header) + 20 bytes (IP Header) + Data Link Header (varies by protocol)
For more information, see the following white paper.
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