asterisk users - Oct 2004 - Transfer caller but on no answer, return to transferee...

So Asterisk gurus out there, is there a nice clean way in the dialplan
to determine if the caller is coming from a transferred call, and on
the unavailable context in the dial, instead of going to e-mail go 
back to the transferee?  

If anyone has this sort of logic or could spit out an extensions.conf
snippet; I'd be grateful.

Thanks.

Is there any way to send a caller to a certain context when the caller is 
forwarded from another pstn number. We are using * as a voicemail server for 
our cusotmers and we are currently providing each vm customer a did to send 
the caller to when their line is busy. I would like setup * to take the call 
and if possible tell where the call was forwarded from and send them to the 
vm context to leave a message.


Is that even possible?



Thanks,


Gary