Interested in using content redirects and Kemp to provide Reverse Proxy services on the minimum amount of IP addresses?
I have been using this as a reference: http://michaelvh.wordpress.com/2014/01/03/publishing-multiple-services-to-the-internet-on-a-single-ip-address-using-a-kemp-load-balancer-and-content-switching-rules/. Written by Exchange MVP Michael Van Horenbeeck, this article lays out what is needed to get Lync and Exchange operating on a single IP.
Up on NextHop, as of 14 February 2014, we also have this: http://blogs.technet.com/b/nexthop/archive/2014/02/14/configuring-reverse-proxy-access-to-microsoft-lync-server-2013-using-kemp-loadmaster.aspx
Of note in the NextHop article is the little blurb at the top mentioning the certification process – nothing like having a reference to the OIP to make customers happy! Also, the official Kemp configuration guidance for Lync 2013 is referenced in case you have a hard time finding that piece of arcana. “If you need details steps or would like to manually create these services, you can refer to detailed instructions provided in “LoadMaster Deployment Guide for Microsoft Lync 2013” located here: http://kemptechnologies.com/files/downloads/documentation/7.0/Deployment_Guides/Deployment_Guide-Lync_2013.pdf”