When I fail, the Publisher, phones re-register to Subsriber, but CFWALL and IP Phones services are not available. Has anyone any ideas ?

Running 12.1.5. What does this mean ?

Users who currently log onto the NT domain via Dial-Up Networking (DUN), must then provide the same Username Password after launching the VPN client. How can I combine both logons, DUN and VPN client, such that Username Password is only entered once....