It is not that simple. But you can begin by doing a traceroute to the many providers at different times of the day. This will see the route changes and time delays between hops to get to VoIP Providers gateways.
The best tool I've found for monitoring connections, routes, congestion,
is called PingPlotter. http://pingplotter.com/ It's a shareware visual traceroute. It continually graphs the traceroute style
responses. There is a scrollable timeline to view how things change.
You can get raw data out of it as well. It records changes in routes.
Their web site also has some tutorials on how to use pingplotter to track down problems.
Unfortunately it's windows only. It will run under vmware though.
I have no affiliation with them. I've just found it very useful.
--Rob
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