TranslatorX is a very nice and simpre tool that allows you to parse and browse through text debug/trace outputs. It works with CUCM Trace outputs and Call Detail Records as well as SIP, H.323, MGCP and Q.931 debugs from Voice Gateways.

Here is an example of TXT-file with debug ccsip messages opened with the tool:

Based on this it can present you a call flow ladder:

Here is an example for Q.931 debug:

Different colors here mean different calls.

By clicking on message string or arrow in the diagram you get the message text:

More info and download on www.translatorx.org