Re: For anyone in the US who has no access to high speed internet
Not sure how well interactive voice will work over a satellite link. You can't get 3G in your area? A lot of folks in rural areas have reasonable cell data coverage and use a dedicated 3G data-only router w/e.g. verizon. Cost per gigabyte will be slightly higher but latency should be much lower than satellite. I used a satellite link up in Sparks NV for a while and it was horrible... it blew up with multiple devices connected to it. Even when it worked well the satellite bounce added huge latencies that made interactive operations really slow.
Vonage is only 'ok'... the kicker is that the handsets (at least when I used it) did not do good echo-cancellation. A land-line still has the best quality over cell/internet, which is why I still have mine. I also have Google Voice and Skype setup. Skype has gotten a lot better over the last few years (though still not as good as a land line), and Google Voice is the *only* good way to do phone number forwarding and voice mail these days. However, *ALL* internet based voice services require a low latency line to work well, which means: DSL, U-Verse, or Comcast, and not 3G or satellite.