reply to ArizonaSteve
Re: It's really very reliable when setup right. My comment was for the Linksys with Mango's instructions, but yes depending on the ATA/IP phone, etc., and many other variables it can become tricky. For example, some people will have to change their router settings, and most people will have some research to do online to figure it out.
However, this is true with most voip providers that do not provide a router.