I need confirmation on whether IM-Only screen sharing is officially supported on Mac.
Please refer to page 59 at: http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/jabber/10_5/CJAB_BK_D...
Specifically, Jabber 10.5 Windows to Jabber 10.5 Mac and Mac to Mac as well.
So far we have it working with Windows to Windows if you allow the ports through but not Windows to Mac or Mac to Mac. The option isn't even there on Mac to Mac.
The Jabber guide would lead you to believe it's supported as it lists Mac in the description of chart: Ports and Protocols for Cisco Jabber for Windows and Cisco Jabber for Mac
49152 to 65535 TCP
M-Only Screen Share
The client randomly selects a port from the range.
The actual range may vary. To find the real range, run the
following command:netshint ipv4 show dynamicport tcp