VoIP Port Blocking by ISP’s

As we head towards ISP rollout of VoIP services in Canada (ouch – $55 a month at Shaw?), it’s interesting to speculate about whether we are eventually going to see ISP’s port-blocking competitive VoIP services, like Vonage, etc.  I hope not – and without looking carefully at the issue I would speculate that given our market structure it could be considered anti-competitive – but port-blocking does seem to be popping up in the US now – via Om Malik, a report on US developments originally reported by Lawrence Lessig.