scott,
i've been using obihai for several years and am STILL learning, so do not feel bad
i KEPT my landline number, becuse my utilities, etc, are registered with that as demographic info (other accounts also), and it is too hard to figure out who had that number.
but we ported it to google voice. I use Obihai to get those calls DIRECTLY in the house, BUT we also have that number ported to BOTH my wife and my cell phones.
this way, if we are ever away from home, we still can receive ALL calls that come to us; either the prior landline, now at google voice, and also our cells.
at least then i can take care of any emergency calls, and reply to other calls at our leisure.
the obihai box, with the ANVEO 911 feature added, is fantastic
good luck
nick