Advice on CDR Reports?

I’m wondering if anyone can provide help or links. I’ve been given access to our FreePBX system to try to mine anything interesting from our phone logs. I don’t know what to make of some of the columns of the report, though. For example, there is a column called lastdata with things like SIP/110,15,trI as the value. Is there some place I can look this stuff up?

Additionally, any thoughts in general on making this stuff useful would be nice. Right now I’m filtering down to where the disposition=ANSWERED and checking out when calls happen to certain extensions and how long they take, but I can’t think of any way really capture everything because I can’t filter out when someone calls their house, etc. It would be really helpful to identify when a call starts at one extension (receptionist) and then ends up at a specific extension (technical support).