Check out a product called 'Internet Thruway" that routes a call based on the Called Number. The idea is for telcos to implement this product as a back-end to their access network so calls being made to a Thruway provider never reach the voice network. It is instead sent (via IP and L2F) directly to the ISP's network. SBC is already committed to deploying this in parts of Texas.
It's a partial solution and expensive to implement. The data calls still have to go through at least the first voice switch.
But it would be nice to receive packets rather than switched circuits and avoid the cost of building so many dial POPs, if the price is right.
They're also looking at deploying it in parts of Missouri. IMHO, the cost is perfect (at least in MO), but I'm leery of the telcos having that much control over the network. Also, I hear L2TP is better than L2F, but haven't read the drafts. Anyone want to back me up on this line of questioning? Timothy