And speaking of that, thats the way I ended up going most recently after giving up on VOIP. The short story on the latter is that I got tired of being put in the middle of my ISP and the VOIP providers, with both claiming any issues were the fault of the other. "My life as telecom tech support" was simply not to be. My advice is, if it works for you right off the bat, great...otherwise send it all back and get your money refunded. If at any point it stops working and a couple of quick calls doesnt get it fixed, send it back and eat your losses.
AT&T (aka "sbc") gave me unlimited local and local long distance on my land line phone for $15 a month. Good enough.
The cheapskate in me made me long for my vonage line @$24/month, but not the weeklong delays in getting return calls for support questions. I also longed for my $29/mo at&t callvantage, but not for the "box" rebooting itself a few times a week and ringing my phone, usually at 3am. I even longed for my $12/mo Sunrocket connection and its delight in garbling my voice and that of the people calling me, along with regularly introducing a few seconds of delay. Why, it was almost as good as using cheap walkie talkies! I was ready to start saying "over..." when i was done talking!
Anyhow, this costs twice as much, but it works.