> >-----Original Message-----
> >From: Arunachalam Venkatraman [mailto:[EMAIL PROTECTED]]
> >Sent: Friday, July 20, 2001 11:54 AM
> >To: Straulino Heiko ICM N MC MI E72
> >Cc: [EMAIL PROTECTED]
> >Subject: Re: [Sip-implementors] Question on handling CANCEL
> >requests in
> >proxy
> >
> >
> >Practically speaking, each request is processed in sequence.
> >So, I would say
> >b is the answer.
> >Do you have a proxy in mind that is constantly scanning
> >incoming messages
> >while processing one message?
Why not ? The proxy could be in a transient state like location
server lookup etc when it received the CANCEL, it could then abondon further
processing of the INVITE and issue a 487.
> >
> >----- Original Message -----
> >From: "Straulino Heiko ICM N MC MI E72"
> ><[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Sent: Friday, July 20, 2001 4:13 AM
> >Subject: [Sip-implementors] Question on handling CANCEL
> >requests in proxy
> >
> >
> >> Hi all,
> >>
> >> i have a question regarding the handling of a CANCEL
> >request in a SIP
> >proxy
> >> in the following
> >> situation:
> >> A proxy server receives an INVITE request. The request is processed
> >> internally
> >> (e.g. location server lookup, etc.). Before internal
> >processing of the
> >> INVITE is finished (and before the INVITE is forwarded)
> >> a CANCEL request for the INVITE arrives. Now should the proxy:
> >>
> >> a) Stop INVITE processing and return a 487 "Request
> >terminated" for the
> >> INVITE transaction.
> >> b) Nevertheless forward the INVITE request and send a
> >CANCEL right behind.
> >>
> >> The -bis03 draft reads as if 487 is only generated by user
> >agents or
> >> redirect servers, which sounds
> >> like solution (b).
> >>
> >> Thanks in advance,
> >>
> >> Heiko Straulino
> >> _______________________________________________
> >> Sip-implementors mailing list
> >> [EMAIL PROTECTED]
> >> http://lists.cs.columbia.edu/mailman/listinfo/sip-implementors
> >>
> >
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> >
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