It is important to understand why a reverse proxy solution is required for Lync Server 2013. In Lync Server 2013, a reverse proxy is required to publish Lync Web Services to external users. These services are responsible for the following:
• Simple URL Publishing—This is required for users to join a Lync Online Meeting.
• Web Conferencing Content—Users will download PowerPoint, Whiteboard, and Poll data through the Lync Web Services when in a meeting.
• Address Book and Distribution List (DL) Expansion—This is required for users to download the Lync Address Book and perform DL expansion.
• User Certificates—Lync Server utilizes client certificate authentication for many purposes; external users must connect to ...