Alice calls Bob, and Bob conferences Carol (Conference 1). Dave calls Carol, and conferences in Ed (Conference 2). Two separate conferences get created; Carol participates in both conferences. At this point, CDR1, CDR2, CDR3, and CDR4 get generated.
Carol presses the Direct Transfer (DirTrfr) softkey on the call to the first conference. Alice and Bob exist in Conference 1, while Dave and Ed are in Conference 2. Conference 1 and Conference 2 get transferred together.
Bob presses the ConfList softkey and has Alice, Bob, and the conference link "Conference" shown in the list. Bob selects "Conference" and presses the Remove softkey. At this point, CDR7, CDR8, and CDR9 get generated. The conference link gets removed, which leaves two parties in the conference.
The remaining two parties get joined together. In Conference 1, Alice and Bob get joined together, and in Conference 2, Dave and Ed get joined together. When the remaining parties hang up, the remaining CDRs get generated in the order in which the parties leave the conference.