I hope this is the right place to provice 4.0 Alpha feedback. A new install of 3CX 4.0 Alpha does not pass the firewall test on the VOIP line. Microsoft ISA Server Firewall settings worked with earlier versions The ISA Server logs show that it is trying to connect to wvps87-230-29-162.dedicated.hosteurope.de on udp port 4200. I am unable to connect to that host on that port. Is this the correct host and port? A tracert shows returns "destination unreachable".