You can continue using GOOGLE VOICE as your landline and without an Obihai or Polycom box and it's even simpler than these complicated voip systems.
Check my info our on my facebook link below. You will need your google voice account, any unused and unsubscribed google app compatiable cell phone (yesterdays cell phone will do) ad the module cell2Jack. It works wonderfully and I've got 11 vtech
phones all throughout my house live with Google Voice.
https://www.facebook.com/bill.agreste/posts/pfbid0n8ULJjDeFY3SGPH68aRKaCnxU9MqKzBXU7kwFCui34GeDcc2pcy56VdFGvnYQRzhl
--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)