I am running IP Communicator over a VPN connection to corp voip CUCM server.
I noticed that if I dialed a wrong number, I normally would hear "your call can not be completed, blah...", and now, I only hear fast busy. so the ANN media path being blocked somewhere.
when I use IP Communicator inside the Corp network (so without firewall), I can hear the prompt.
who could provide some clue regarding the ANN traffic/stream info at TCP/UDP port level?