asterisk users - Nov 2013 - terminating the call, when transferer hangs up the call during attended transfer

Hello guys,

I'm vainly trying to figure out how to setup quite a strange
customers requirement:

they require that when during attended transfer, (A->B->C)
whenever B hangs up the call before it's connected to C,
the call just returns to B, instead of changing to blind transfer.

I tried using atxfer drop call option (enabling null channel in sources),
but to no avail..

Is there some way how this could be achieved?

thanks a lot for any help..

with best regards

nikola ciprich

-- 
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Ing. Nikola CIPRICH
LinuxBox.cz, s.r.o.
28.rijna 168, 709 00 Ostrava

tel.:   +420 591 166 214
fax:    +420 596 621 273
mobil:  +420 777 093 799
www.linuxbox.cz

mobil servis: +420 737 238 656
email servis: servis at linuxbox.cz
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So:
A calls B
B answers
B puts A on hold
B calls C
B talks to C
B ends conversation with C
B talks to A again, regardless

I this correct? Looks like a simple "Hold" exercise.

jg