Try reviewing these if these are of any help:
http://www.cisco.com/c/dam/en/us/td/docs/telepresence/infrastructure/vcs/release_note/Cisco-VCS-Release-Note-X8-2-1.pdf
http://www.cisco.com/en/US/docs/telepresence/infrastructure/vcs/config_guide/X8-1/Cisco-VCS-Microsoft-Lync-Deployment-Guide-X8-1.pdf
Also check this post and search content sharing:
http://blog.networkfoo.org/2014/10/integrate-cucm-and-expressway-c-to.html
-Terry
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