Rui Maximo has written a very nice little PC app that shows the firewall rules required between various Lync components. It is quite simple to use, on the left select the Source, then on the right the Destination. The app then gives an easy to read and graphical representation of the traffic. At the bottom of the screen it shows detailed protocol, ports, purpose, whether configurable or not and even an URL to the documentation about this traffic.
Nice work Rui!
Also, I’m sure Rui would appreciate your comments on twitter https://twitter.com/#!/rui_maximo