Can I extract data from an on-going call at Call Detail Record?
I don't know if you got your answer to your question.
Normally a CDR record isn't logged until the switch received disconnect supervision for either end. This is because the record is written after the length of call is determined.
What you are looking for is a snap shot or a looping trace on a TN/DN.
What you probably are looking for is a real time trace. I'm new to Call Manager, I have done some CDR analysis from data received from Rolm and Nortel switches.