Hold on a sec!!
Changing CDR type from OLD <-> NEW could result in malformed MDR CDR Collection and Call Accounting Application Data.
First,
1. Are you using the data for Call Accounting purposes?
2. Are you collection your RAW data to an MDR2000, Direct Serial or IP?
3. Are you in a position to experiment with CDR or is it vital to your organization?
If your using an MDR2000, before you make changes to the CDR data type, you need to modify the settings in the MDR2000.