In my area, at least, Time Warner Telecom delivers local dial tone via a T1 and a channel bank. Now this company started out as a local alternative long distance carrier, using Smart-1 diallers, and morphed into a CLEC, before being bought out, going bankrupt, and bought out by AOL/TW.
They have their own Central Offices, and have the ILEC install a point-to-point T1 to the customer premise. They hang a channel bank off of that. With the 24 channels, they can deliver dial tone from their own CO switch, and fractionalized T1 for internet access. Each channel for dial tone appears like a POTS line. They don't offer DNIS or DID via a channel bank, only into a T1 card in the customer's switch. They actually port the customer's old ILEC numbers through Number Portability.
One other company expanding into our area offers Voice over DSL, similar concept except it's a dry pair from their COLO to the prem, and some different hardware from a channel bank. So far I'm not too impressed, but it is getting better.
