asterisk users - Dec 2004 - Need help with cisco 7960 call fwd and dial plan

I have users that use Cisco 7960 with asterisk, if a user sets the
call forward on the phone than asterisk will just go to that extension
priority one. However I want to put in some logic in the Dial Plan
that if the call was either transfered or if it was call fwd (302
moved temporaryly) I should know about it.
Thanks.