I always assumed that the others were covered somehow in the normal charges from my VoIP providers, or that they just didn't apply anymore. Well, I wasn't quite correct in that assumption.
My main VoIP provider, Vitelity, is starting to charge for the Universal Service Fund, and is doing it at payment time when people refill their prepaid balances with them. I pay enough to cover 3 months at a time, so that means I still have one more tax-free month. They're doing a credit for those with non-voice services on their account, but I don't know if I'll see any of that, as they give things like dedicated servers as examples. I do have a fax-to-email number on mine, though, so we shall see.
At the very least, it 1) is less than $40/year at the moment and 2) can be partially expensed as 2 of the lines are business related. It'll certainly make calculating those expenses more interesting, though.
Now I'm left wondering if the other provider I use, Gafachi, will be doing something similar at some point.