Troubleshooting a complex server product like Lync Server 2010 can be a challenge. Lync Server has troubleshooting features that enable you to quickly check the overall health of your system. These three videos provide guidance on several of Lync Server’s new troubleshooting features.
System-wide Troubleshooting: Lync Call Connectivity
This video shows how to use the Call Diagnostic Summary Report of Monitoring
Server Reports to analyze system-wide call activity in order to identify and
resolve potential Lync call connectivity problems.
Help Desk Troubleshooting: Lync Call Issues
This video shows how to use User Activity Report of Monitoring Server Reports
to analyze technical details about user calls in order to identify and resolve
Lync call issues.
Monitoring and Managing Jitter for VoIP
This video helps you understand jitter in VoIP and how you can use Monitoring reports to troubleshoot and manage problems with jitter in Enterprise Voice.
Read more at source: http://blogs.technet.com/b/nexthop/archive/2011/10/10/monitoring-and-troubleshooting-lync-call-videos.aspx