Let me explain.
I use Jabber 10.6 for Windows, connected to IM Presence server v10.5
I use a Tandberg VCS server. 8.7.2
I use a Cisco Conductors X4.0.
When I do a call between two Jabber clients, the video is OK, the audio is Ok, and the share desktop is OK.
When I do a call between a Jabber client and the conferencing system, the video and sound are OK, but the Desktop share button is greyed out.
I cannot share a desktop when connect to the meeting room.
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On CUCM in the SIP profile menu, the "Allow Presentation Sharing using BFCP" option is checked.