said by daveinpoway:As I stated earlier, if I had an emergency and a guest had to call 911, as soon as they picked up the phone, it would default to the AT&T landline and emergency calls could be made there. It would be necessary for them to manually select another line in order to connect to the VOIP service.
Pick up the phone, get a dial-tone from AT&T and dial 911. What could be more simple?
I understand the point you are trying to make, and you have a good setup. But you are the exception, and not the standard.
There are other things to consider. What if the guest panics and starts punching buttons before getting 911 dialed? What if your land-line goes out? The odds may be slim, but what happens if a car accident takes out the remote terminal around the time someone in the house is having a heart attack?
Just something to think about.