Build your own dial-up ISP in 2019

This tutorial should work with any dial-up modem that presents itself as a serial device to the operating system, including cheap USB modems, ISA modems, PCI modems and of course external RS-232 serial modems. I’ll be using an external serial modem + USB-to-RS-232 adapter for this tutorial. When using an external modem, the choice of USB to RS-232 adapter seems to be crucial.

Source: dogemicrosystems.ca