asterisk users - Jun 2009 - Bug or feature : how to customize SIP REFER from dialplan

Hi,

I've been editing my dialplan to launch custom instructions anytime a SIP
REFER-based transfer occurs.

The only hook I could find is catching an hangup event which is tied to a
Zombie channel
(ie a channel named like SIP/1234-vhvebjvnv<ZOMBIE>).

Is this a feature or a bug ?
In other words, do you think :
- it shouldn't be possible at all to hook custom instructions for SIP
REFER-based transfer occurs (then I obviously found a bug),
- catching ZOMBIE channel hangup is the way to hook custom instructions for
a SIP REFER-based transfer.

Regards
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