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How do we calculate the delay and jitter in VoIP?

Posted on 2005-04-28
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I have seen a question like this on this site, but when i viewed the answer I have noticed that it is the RFC 1889 with no further description. Unfortuanatly the RFC 1889 doesn't describe the algorithm well especially the (s->jitter) variable.

I would like to understand how the delay and jitter are calculated in a detailed description.

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Question by:voipbau
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Accepted Solution

Delay is the amount of milliseconds difference between when the packet is sent and whenthe packet is received.

Jitter is the variation of delay - there are different ways to assess it, packet by packet or by average times, deviations from average, and so on.
One simple way is to take the difference. For example:

3 msec
5 msec
5 msec
8 msec
20 msec
1 msec

the average delay is 42 msec /6 = 7 msec

the jitter would be 2 (5-3), 0 (5-5), 3 (8-5), 12 (20-8), 19 (20-1).

Jitter is usually measured by max, since that is what affects the Jitter buffer tuning that can be done on the voip endpoints.

This is a basic explanation - what exactly are you looking for?
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