Hello.

You always have to look at the final destination first - if it's not showing Jitter, then any Jitter in intermediate hops is a reporting artifact of the intermediate hop only, which almost certainly doesn't affect the end result of your VoIP conversation. Hop 3 is almost certainly *not* your problem.

See here for details:

http://www.nessoft.com/kb/24

and here:

http://www.nessoft.com/kb/47

VoIP really requires latency of < 300ms to work reasonably well. 600 ms of latency is going to be a very challenging environment to make work well for voice. Probably not impossible, if you accept certain limitations, but pretty bad (as the MOS score shows).

- Pete