Hi. I have the 3CX Server on my Home and it is working fine. I have a second home and I want to connect to the 3CX Server to use the same PSTN line. Where 3CX Server is instaled I have Windows 2003 Server with Isa Server 2006. The Isa Server is configured to be a VPN Server. I can connect to the VPN Server but when I make a call the audio it failed; or there is no audio in both directions. This occurs because I'm using the Isa Server as a VPN Server? If I use this VPN server, my problem stop? D-Link DI804HV http://support.dlink.com/emulators/di804hv/hwiz.htm That http://www.3cx.com/blog/releases/sip-proxy-manager/ can help me? I'm using Bria Professional as a softphone.