I got several machines up and running from the main system. Everything runs off the ION hub, including the 2nd phone line. The main phone line is the same number and can be used at all jacks throughout the house. Not sure about that one. I've been with Earthlink since 1994 and it is an outstanding company.
Email servers are good, but news servers suck.
Overall, for having the service less than 24 hours, I am extremely happy with the service. I think I am even more satisfied with the experience with Sprint. The support and info from the reps is outstanding. The outstanding knowledge and professionalism of the installers was an unexpected surprise. The value is great.