Hi,Clay28,
As I know if a call made by user is prevented by CAC,the call will be rerouted with the order of precedence as follows:
- Internet
- PSTN
- Voice mail
So there will be no message showed to users since it will be rerouted to the callee or to the callee's voice mail per my knowledge.
You can read through the TechNet document
Overview of Call Admission Control,and here are some great articles for a more in-depth explanation of this feature.
http://blogs.technet.com/b/jenstr/archive/2010/10/07/bandwidth-management.aspx
http://blogs.technet.com/b/drrez/archive/2011/03/28/simulating-lync-server-2010-call-admission-control-in-a-lab-environment.aspx
Hope these can clarify your question.
Regards,
Sharon
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