Some friends and I have discussed setting up a PPP dialup Internet gateway (solely for private use) for fun/nostalgia purposes. I've been reading through the Linux-PPP Howto at TLDP (old, I know, but a good starting point at least), and I came across something that I can't seem to figure out what it is.
In any case, being able to have multiple people dialed in at once will probably require a special service from the phone company which I'm not going to pay for for something that's just for fun, so we'll just do without, but nevertheless I am curious as to what sort of hardware you'd need.
On this page, the HOWTO author refers to a "rotary dialer" as the thing that provides a single number to access a modem pool. I was curious about it, but when I Google "rotary dialer" everything that seems to come up on the first several pages refers to the old rotary telephone dialing interface (or mockups of it for smartphones), which clearly isn't what the HOWTO is talking about.
Again, I have no intention of going so far as to incorporate this, but I am curious--is there another name that the sort of device the HOWTO is referring to is known by?