asterisk users - Jul 2006 - setting cdr userfield in .call file

Is there a way to set a value for the cdr userfield in a .call file?
Like the way you can do:

Account: accountnum

Anything like Userfield: usernum that I can use?  I'm aware that you can use
exten => X,s,1,Set(CDR(userfield)=xyz) in the dialplan, but I want the
userfield to be filled out even if the call isn't answered and thus
doesn't make it into the dialplan.


thanks!
Cory