[Serusers] Differentiating between NO ANSWER and HANG UP

Hello everyone. Is there a way in my ser.cfg I can tell the difference between calls when a user hangs up and when there is no answer by the called UA? It seems to me that the return codes are the same, ie 487. BUSY is OK because that returns 486. I'm trying to figure out how to route calls to voice mail when there is no answer only. I don't need to send the user to voice mail if the caller simply hangs up. It's almost like RFC2543 needed to define return code 487 as NOANSWER and a new code 488 as HUNGUP Is there a way to accomplish this? Regards, Paul _______________________________ Do you Yahoo!? Declare Yourself - Register online to vote today! http://vote.yahoo.com