Assuming you have an Obi110, there are lots of things you could do - call forking, forwarding, allowing friends with Obi's to access your Ooma from elsewhere, use of a softphone client to access your Ooma from a remote location....the list goes on and on. Just do a forum search for Ooma or Vonage and the topics that interest you and I am sure you will find lots of examples of what can be done.