My comments inline.

        -----Original Message----- 
        From: [EMAIL PROTECTED] on behalf of Anish. T. George 
        Sent: Wed 12/14/2005 10:52 AM 
        To: 'Sip-Implementors (E-mail)' 
        Cc: 
        Subject: [Sip-implementors] Scenarios for 487 response
        
        
        
        
        As my understanding, 487 can be received when the request is cancelled 
with
        "CANCEL"
        or invite requests expires if Expires header is present in INVITE 
request.
        
        If i havnt added an Expires header and i dint cancell the request,
        Is there any other scenario where i can get 487 for an INVITE request ??
        
        <Amith>

        You would get 487 response when you have sent a BYE and the UAS which 
receives the BYE request, has pending transactions on the dialog the BYE was 
sent on. 

        </Amith>

        Hope that helps.

        cheers,

        Amith 

         


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