Correct call duration when transfer a call

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Hi.
I am new to asterisk.
I have an ivr application with asterisk and voiceglue. I make a call from
asterisk (say to A) and when callee press a button voiceglue transfer the
callee to another number (say to B). When I look cdr records the billsec
between A and B always 0 and billsec with A shows the billsec for A and B.
I am confused. Is there a reliable way to get the real call durations?
Best regards.