asterisk users - Jan 2020 - How to correctly fork a CDR for billing in a call forwarding scenario?

Hi Gang

I have not yet managed to find a solution to correctly generate CDRs
for this situation:

Alice calls Bob.
Bob has call forwarding delayed 20s to Charlie.
Charlie picks up immediately.

exten => bob,1,DBget(cfwdly=CFDLY/${exten}); $cfwdly contains charlie
	same => n,Set(CDR(src)=${CALLERID(number)}) ; src 'alice'
	same => n,Set(CDR(dst)=${exten})
	same => n,Dial(bob,20)
	same => n,ForkCDR
	same => n,Set(CDR(src)=bob) ; 2nd cdr src shall contain 'bob'
	same => n,Set(CDR(dst)=${cfwdly})
	same => n,Set(CALLERID(number)=bob)
	same => n,Dial(${cfwdly})

Now assume a call of 1 minute.

For billing purposes, I need 2 CDRS.

Billing to Alice: Call of 40 seconds to Bob.
Billing to Bob: Call of 40 seconds to Charlie.

I would expect that setting the custom variables as above and forking
the CDR would generate CDRS looking like this:

no;src;dst;duration;billed;status
1;alice;bob;60;40;answered
2;bob;charlie;40;40;answered

But that is not happening. Booth CDR contain the same source and
destination.

I have played around with the various ForkCDR(options) but none did
what I expected.

Mit freundlichen Grüssen

-Benoît Panizzon-
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