There's no real such thing as POTS "from that point on" anymore. The access and termination points are of course dependent on Rogers and the terminating carrier. But the in-between part is pretty much a dog's breakfast, and that goes for Bell POTS, SBC, Rogers, or anyone else. To understand why, see a minutes trading marketplace like Arbinet. A pretty impressive proportion of "POTS" LD traffic was transiting as IP and, in many instances, over the public Internet as of years ago. And it's been a long time now that TELUS announced that it had converted its network core to IP. Fundamentally, what matters is whether the carrier is managing its own traffic on a dedicated network, or whether it's leaving it up to someone else to deal with. The latter describes the Internet. The former describes internal traffic engineering -- IP over ATM over fibre, TDM over ATM over fibre, TDM over frame-relay over satellite, whatever. "POTS", after all, is not a protocol, only a service specification.