reply to horacebork
Re: voip is digital - why use an ata? For home use, there's nothing wrong with an analog phone. They are simple to use and simple to set up. The average person doesn't need any more functionality than what can be found in a basic $20 desk phone or sub-$100 multi handset cordless system.
ATAs are simple to set up - especially the OBi devices. You can plug several phones into them and they all ring at the same time without messing with anything other than the initial configuration.
As far as sound quality goes, an ATA is just fine. A large number of people have considered that the relatively poor sound quality of mobile phones is good enough to use as their only phone, so clearly sound quality isn't that huge of a factor for most people.
For businesses with several people, the benefits of IP phones are a lot more clear.