Yes you can. I have an application that get the phone number and duration of the call and calculate how much is the cost of that call.
I use a library crystalcomm. Check at
http://www.hallogram.com/crstlcom/index.html
"Anyone who has never made a mistake has never tried anything new." A.E
"The important thing is not to stop questioning. Curiosity has its own reason for existing." A.E