HI Nathan. Yes, this will work.
I'm running VCS X7.2.1 at the moment and CUCM 8.6.2. Couple of things you need to check:
VCS configuration
In Cisco VCS, go to the CUCM neighbor zone and:
1. Change the Advanced Zone profile from Cisco Unified Communications Manager to Custom.
2. Set the parameters as documented in “Appendix 8 – Parameters set by the ‘Cisco Unified Communications Manager’ Advanced Zone profile”.
(http://www.cisco.com/en/US/docs/telepresence/infrastructure/vcs/config_guide/Cisco_VCS_Cisco_Unified_Communications_Manager_Deployment_Guide_CUCM_6-1_7_8_and_X7-0.pdf)
3. Ensure that SIP UDP/BFCP filter mode is set to Off.
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CUCM configuration
In the SIP profile used by the SIP trunk to VCS, select “Allow Presentation Sharing using BFCP”
On CUCM
1. Go to Device > Device Settings > SIP Profile.
2. Select the check box by Allow Presentation Sharing using BFCP.
3. Click Save.
4. Click Apply Config.
5. Click OK.
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If you still have problem, on VCS, you can Navigate to Maint>Diagnostics>Diagnostic Logging and set Network log level to debug. Start new log, place call, see if you can share, and if not, disconnect, stop logging, and we can take a peek at the log to see if everything is ok.
Let us know?
Thanks in advance.
VR
Patrick