I just tested it on one of my boxes and it seems to be working. 

There is one of three things happening here:
[1] The port is not actually open (UDP Outbound 3932)
[2] The address in the back end should only be set at voice-il1.branzone.com (Do not add the port here)
[3] The ventstatus file needs to be chmod to (minimum) 744

Try those, if not -- let me know when I can jump on your vent and I will assist.