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This topic describes how to diagnose and resolve system-level problems that occur during daily operations of a Cisco Unified Communications network. It contains the following sections:
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Common Problems Reported by Users
•PBX Interoperability Issues with Cisco Unified Communications Manager
•Using Call Flows to Resolve Call Processing Problems
•Failover and Recovery Procedures
For an expanded list of general problem areas, as well as other system troubleshooting topics, see the documentation wiki (DocWiki) at http://docwiki.cisco.com/wiki/Unified_Communications_System_Troubleshooting 
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