It's really hard to understand the CUCM trace log, is there any document can help to understand it ?
I know there is a sofeware VLT, it can translate the SDI trace file to easy understand form,but I think this is not good engough , and this software will not translate all the log.
I have created this document that describes how to track an H.323 call in a CUCM trace:
I plan to create documents for SCCP and SIP at some point in the future, but this should get you started with the basics of H.323.
If you find it helpful, or have questions on the doc please feel free to rate or leave comments.