I had the same problem with our Unity system. We did several things to fix it.
1)ran exchange optimizer on the exchange server
2) ran disk defragmentation on the Unity server
3) check you memory using task manager, performance and make sure that you don't have alot of paging to disk going on
4) take a sniffer and capture a a call going into the Unity server and make sure that the DSCP (or ToS) and COS settings are correct. If not, then back track to the call origination point and start your trace until you figure out where the DSCP (ToS) and COS are being re-written.
Our's was both a memory problem and QoS settings problem.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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[toc:faq]CUCM Database Replication is an area in which Cisco customers
and partners have asked for more in-depth training in being able to
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