Ah, apparently you need to be whitelisted, my bad. There’s more information in the Reddit link.

EDIT: Nope, apparently the person who runs it takes it down at night for some reason. Maybe to minimize people using it as a prank call?

You do have to get whitelisted though, last I checked. I was able to use it one time and now if I call it I get a message about whitelisting. Same for JollyRoger.