This would work and have the benefit of not having to even replace the phones that exist.

The other route OP could take would be to get some rather good commercial wireless AP’s. You still have to sort out power but the phones can go anywhere.

But for wall mounted modern phones, it’s just easier to run ethernet from a powered switch. Then it’s just 1 cable per phone gives you the power and network.

This was incredibly helpful. Thanks!

Yeah. Which is partly why I want to know how everything works.

If I have to build my own solution that parses line by line through a CSV and runs logic, queries a DB that gets updates with new tax tables and spits out numbers so bet it. I’m willing to go that far since I have a background already doing similar things.

I’m guessing someone may just direct me to all the FCC rules, guidelines, and tax literature. I would be happy with that as well as long as it was complete.

I probably don’t want to maintain this forever but it can’t be that impossible to calculate everything for your first few customers.

This is the exact answer I’m not interested in, unfortunately. I’ve already gone through the trouble of figuring out how to do everything else myself including the 499 filing, the 4 digit identifier, even how to stir/shaken sign everything.

I’m just looking for how the tax side functions since I haven’t seen it anywhere or if I have it wasn’t nearly as detailed as I was looking for.