I am using att_xfer for conversation between A, B, C

A calls B, B calls C then B press 0 to create conference.

There is 3 CDR record as expected but

if C answer the call then all 3 CID_name is "Outbound Call" and All 3 "CID_number" is C's number

however if C dont answer the call then all 3 records are just showing fine.

So anyone can explain this behavior..!