Some time ago Rick Varvel create a very detailed guide on how to configure the Edge server role. Rick has now create a similar very detailed guide on how you can upgrade your Microsoft Office Communicator Phone Edition devices - http://blogs.technet.com/rickva/archive/2009/10/03/ocpe-device-tanjay-upgrade-guide.aspx. It also cover all the necessary environment dependencies and how to configure them. Definitely worth studying!