There are phones A, B, C
Phone A calls B.
Phone B answers the call and Presses Conference button, then dials phone C.
Phone C answers.
Phone B presses Conference button again and all there phones are in
conference call now.
This test example generates six CDR records in CDR and six entries in CAR database
Where numbers are:
Phone A called phone B (calling_party_number and final_Called_party_number)
Phone A called Conf Bridge (b00312601001)
Phone B calling phone C
Phone C calling conf bridge (b00312601001)
Phone B calling conf bridge (b00312601001)
Phone B calling phone A
There are 2 solutions already out there
http://litescape.com/legal.html
http://www.copitrak.com/phonetrak.html
HTH