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jitter question

What kind of jitter is normal between the voip sites? I installed Cisco IPM and found that the jitter varied between -7ms to 7 ms. Is this ok? Any cisco document discusses this? thanks

2 REPLIES
Hall of Fame Super Silver

Re: jitter question

7 ms shuold be undetectable, anything below 30 ms is fine.

Chris

Re: jitter question

Hello,

the underlying limits are given by the dejitter-buffer in use and the total end-to-end delay maximum.

The total end-to-end delay should be (ITU G.114 recommendation) below 150 ms. Please understand, that this is not a hard limt, even 250 ms can be ok. The is a good potion of "psychology" within voip - some users might accept it, some not.

A dejitter-buffer counts against this limit. Per default you have usually a buffer of 30 ms. Jitter below this will be handled by the buffer, which should result in no degradation of voice quality.

Your 7 ms are well within the limits and there should be no noticeable effect for your users.

Hope this helps! Please rate all posts.

Regards, Martin

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