asterisk users - Jul 2004 - Cisco 7940 hook-flashing blind xfer.

I've been unable to figure out how to make blind xfer transfer a call on
a zap interface by using hook flash instead of a native bridge.  Is this
even possible to change how a blind xfer works on the 7940s?

zapata.conf:
threewaycalling=yes
cancallforward=yes
transfer=yes