Originally published on the Microsoft TechNet Wiki http://social.technet.microsoft.com/wiki/contents/articles/15396.understanding-simple-urls-in-lync.aspx Intro A Lync deployment that has to be available to users outside our internal network / firewall (the generic definition used is “external users”) requires two additional servers : a Lync Edge server (for IM and presence, Web conferencing and A/V conferencing) a reverse proxy to publish features, … Continue reading Understanding Simple URLs In Lync