Trouble on the line

[Vox Populi Vox Dei]

"I contacted the ISP and was told it did not support third party VoIP," explains Peckler. "Vonage ran a test. It seems the ISP was blocking the cable modem when the Vonage adapter went into use. I ran a test of my own. I ran pingplotter for 10 minutes: no blockage, then I picked up my Vonage phone and placed a call: immediately there was a 100% blockage on the cable modem. This was a continuous loss as long as the phone was used."

http://technology.guardian.co.uk/weekly/story/0,,1747343,00.html

AFAIK this is illegal in the States so I'm not sure why they're allowed to continue with this practice.