[http://4.bp.blogspot.com/-eaZAd9DSUGE/UvuEuqmdrwI/AAAAAAAAAKA/K5dEBaaBToE/s72-c/Lync+Firewall+Rules.jpg]
Randy’s Lync and UC Blog: Firewall rules and data flow for Lync 2013

http://lynciverse.blogspot.co.uk/2014/02/firewall-rules-and-data-flow-for-lync.html