You're right on. That's a vintage phone terminal block, the forerunner of the grey plastic demarcation boxes more recently installed on outside walls. It's from the days of rented phones and "call long distance anywhere in the world for $12 for the first 3 minutes."

The heavy wires coming out of the ceiling are from the incoming phone line, the big wire on the center terminal goes to a ground, and the other wiring connects to phone jacks in your home. The big brass hex "bolts" at the top aren't actually bolts. They cover the "carbons," which serve as lightning surge suppressors.

If the phone line is still active, there will be about 48 volts (CO voltage) across the outer terminals.

If you're no longer using a landline, and are sure you won't again, you can rip out all the phone jack wiring. Disconnect or cut the phone jack wires right at the block's terminal screws before cutting any cables.

If you have a grey demarcation box outside (likely), it also provides lightning protection. That means you can also safely clip the incoming line wires and ground, and get rid of the terminal block. In theory the block is telco property, but I'd be very surprised if they want it back.

It's the protector block for your phone lines (i.e., a lightning arrestor, note the ground connection in the center). If you have one of these inside, I can bet (unless something has changed subsequently) you don't have a modern demark on the outside. Otherwise, David is correct.

I have these old guys in my own house, and in one of my rentals. In both cases, the telco has also installed a demarcation box outside.

But I see your point. I probably shouldn't have said that it's likely that the OP has one. A sample of two has no statistical significance. As market researchers like to say, the plural of "anecdote" is not "data."

It all depends on whether they've had cause to come out and do something on the house or not. With rentals, you probably have a phone guy potentially every time there's a new tenant. If he's got an older single family house, there could just be this archaic thing.

Note that connected landline voltage is 48volts DC. A doorbell transformer will put out 10 to 16 volts AC.

And the ringing voltage is about 90V 20Hz.

Thank you guys for all of your input. Glad that I can get rid of all the wires, they were hanging on the basement ceiling and really bugging me.

When you say "get rid of all the wires" are you saying that you are going to remove the wire all the way out to the telephone pole on the street? If not, it's best to leave the protector and the ground wire in place - you can remove all the "smaller" wires or just cut them back to the point where they are no longer visible.

As I tried to say above, if the OP has a telco demarcation box on the outside of the house, it's safe to rip out all this stuff, because the demarc has its own lightning protection.

If there's no demarc, you're correct that, for safety, the terminal block should remain connected to the incoming line and the ground.

Another consideration in how much of the wiring to remove is whether the OP, or someone who might buy the house in the future, will ever want to have a landline again. I wouldn't bet that no one ever will, but that's me.

It is definitely phone. It is old but unless you upgraded your service at sometime it could still be a grandfathered in connection. Nothing is upgraded unless a technician needed to go to the home. Unless you don't have a landline and never plan on moving, selling or renting this you could cut the line. But it looks like there is enough wire to just move the connection off that piece. This looks like your utility area why do you need it gone? Would you cut your electrical because you aren't using it in a room now? The lower voltage phone line isn't going to hurt you but like anything once it's gone it will cost you to replace it.