Hi, I've been in the same boat as you for a while now and unfortunately Cisco does not provide much for the CDRs. Yes there are a couple third party tools, though from my experience, they are horrible. What I ended up having to do was take the files, and setup a script with a scheduled task to consolidate the files to one csv file once a day. Then using SQL, I setup a job to import the file daily into a database. There may be other ways to import these csv files into SQL, though this seamed the best since there are so many files generated each minute with different names, though I'm not a SQL expert. Anyway, once you get the files into SQL, you can then use something like Crystal Reports to generate your reports.
I know this is a bit of a pain, but it gives you the most control and flexibility without paying a third party vendor for junk software (ie Metropolis).
If you need some assistance, let me know and I'll see what I can do for you.
