[asterisk-users] terminating the call, when transferer hangs up the call during attended transfer

[jg]

in features.conf there is the option "Disconnect Call" that retrieves the call from callee C.

Depending on your setup you may need to change it to something like "*0". I don't like single 
'*' or '#' keys as some of these combinations might trigger a reboot of some phone models.

jg