> We've learned to pick our fights, and this isn't one of them.
The most effective mechanism I've seen for explaining the problem is latency and VOIP.  Set up an artificially latency-ridden, high bandwidth connection, then connect to a PBX using a softphone.  One call is generally sufficient proof of the issue.
Gov: Speedtest.net is an authorative location for all testing.
Speedtest.net: Anyone can host our test application, so that is clearly false.
Gov: The only important factor in certification is bandwidth to speedtest.net.
Speedtest.net: We offer other connection quality tests that don't rely on bandwidth.