A:Answer I would say YES a Magic Jack can be connected, but NOT directly to the modem. I have two Magic Jacks, therefore two different phone numbers. One MJ is connected to one of the Windows 7 computers (via USB port) on the wired network. The other MJ is connected directly into a Linksys 8 port switch then is connected wired over some distance to the Linksys router.
Both MJ work well with this configuration. Hope this helps.