How can I get some specific call usage data from Cisco Call Manager 6.1

I need to find a way of extracting the total numbers of calls made from a specific subset of extensions. I've tried using CDR and have not had any real success. What I want to do is extract the total into a specific formatted CSV file (the CDR one is rubbish!!) on a regular basis so I can use the file to update a website. I know this is sounding like call centre stuff (well actually it is as it's for a call centre) but I do not have any access to call centre software.
This requirement has come out of a need for our outbound telemarketing team to get useful stats. If anyone knows of a solution for outbound call centres that does not use predictive dialling or any other predetermined dial rules, I would love to hear about it.