Test network Jitter interoffice VoIP

Our VoIP setup includes a Netscreen 5GT and a Shoretel VoIP PBX.  I am needing to determine whether we are having issues with our download speed (512 kbps) or network jitter caused by the VPN.

What public tools are available to measure this?
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thepnerAsked:
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grbladesCommented:
There are some very good links here - http://www.voip-info.org/wiki/view/QoS
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veruscorpCommented:
A good tool would be Pingplotter pro, available at http://www.pingplotter.com

The tool will graph latency to one or more sites over time.  It also will measue jitter and can show latency for each hop along the path if you so choose.  It can also export the graphs as .png files for you.

As far as measuring download speeds, a simple check to an ftp server can give you a good grasp of your bandwidth, download a file, and divide the size of the file by the time to download to get Kbps.
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