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# How can calculate the jitter for VOIP ? (200 --> 400 points for this question)

Posted on 2002-04-02

I search on internet and find some formula for calculating the jiter buffer as following

The mean deviation of the difference in packet spacing at the receiver

Si = the RTP timestamp for packet I

Ri = the time of arrival

D(i,j) = (Rj-Sj) - (Ri- Si)

The Jitter is calculated continuously

J(i) = J(i-1) + (| D(i-1,i) | - J(i-1))/16

However, I don't know it is correct or not .

Could some experts give me the formula and show examples in all different cases (have and don't have package lost ...)

Thank for reading .

Note : if it is a very good comment or this is a hard question,

I will give 200 points bonus ==> 400 points for this question.