I did something like this many years ago, but not recently. So I've come to the brain cache!!
I have a client that can only do dialup. Broadband has not reached them. What is a common &/or reliable way to connect them thru a dedicated phone number to the internet, keep the connection alive, & allow everyone to access it with disconnecting or messing up someone else already online. I use to use a modem & some software (AnalogX) to do this that kept the connection open most of the time.
I know that there have probably been some new software & hardware created that can do this better than what I use to use.
So any suggestions would be greatly appreciated!!