We've been using a free Google
voice account coupled
with an OBi200
phone adapter for almost
a year now and feel like it's a good land line option.
There have been a few times
when the internet was down we had to use a mobile phone to report the
outage.
One feature we like is the
fact that we can send and receive text messages on our home computers.
A caller ID message pops up when someone is ringing in and voice
messages get transcribed and emailed to you.
There was no land line phone
choice in our area but it seems like this option is almost as good. We
do pay 25 dollars per year to access the 911 system but other than that
the phone adapter has paid for itself when compared to the cheapest
land line price.