How do I determine the size of the packets I'm sending during a VoIP test? (NETIQKB512)

  • 7700512
  • 02-Feb-2007
  • 13-May-2010

Environment

Vivinet Assessor 3.x

Situation

How do I determine the size of the packets I'm sending during a VoIP test?

Resolution

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)



note

For more information, see the following white paper.

https://www.netiq.com/Downloads/Library/White_Papers/NetIQ_Evaluating_Data_Networks_for_VoIP.pdf

Additional Information

Formerly known as NETIQKB512

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