[Asterisk-Users] IAX port numbers?

[Matt Lawson]

I see that when an Asterisk connects to another one via IAX, it seems to 
use port 4569 for the first one.  But if it has multiple IAX connections 
the additional ports seem to be chosen at random.

Is there anyway to predict, or specify which ports or range of ports to 
use, for the sake of setting up a firewall?  Thanks.