Hi. I found out why onioncat wasn't working and configured it 
accordingly with help from Bernhard. It was a peculiarity that had to do 
with our specific two machine design.
Now VOIP works. Linphone is what we'll be using. Thought I'd tell you so 
you guys can add that too.
Details:
https://www.whonix.org/forum/index.php/topic,407.msg3360.html#msg3360