We get a lot of questions on how to publish Lync with UAG and TMG. In this article the UAG Team blog members give you a method to publish some of the components of Lync using UAG. Unfortunately, its not a universal fix, but its better than nothing.
http://blogs.technet.com/b/edgeaccessblog/archive/2012/06/15/lync-publishing-on-uag.aspx
HTH,
Deb