Call setup time

I would like to ask if it is possible to measure call setup time, the time between “start” and “answer” in CDR in miliseconds. Or just simply with bigger resolution than seconds. I tried ${CSV_QUOTE(${CDR(start,f)})}, but it is not working. Thanks for any replies and tips even for some other possible solutions, than CDR.

I think you can use “Call Event logging” (CEL) module.