asterisk users - Dec 2010 - Caller id is not proper when I do call forward

Hi
     Caller id is not show showing proper when I do call forward from 
asterisk,bellow is the example.

     1001 called 1002 and 1002 forwarded call to 1003 then callerid in 
1003 phone is showing 1002,this is wrong it shound be 1001(he is actual 
caller).

     If u do blind transfer instead of call forward it will show 
properly.Please correct me I am wrong

Thanks
NIkhil