----- Original Message -----
From: "Straulino Heiko ICM N MC MI E72" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, July 20, 2001 5:13 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).
I think that (a) is the right thing to do. In section 5.2 it says:
A stateful proxy that receives a CANCEL request immediately responds
with a 200 class response. It then generates a new CANCEL, and
forwards the request to all destinations with pending requests.
Since the INVITE has not been forwarded, there are no "destinations with
pending requests". A final response (487) to the INVITE is expected by
either the UAC or the forking proxy that generated this "branch". The
response would look like any other 4xx-class response that the proxy might
generate.
>
> Thanks in advance,
>
> Heiko Straulino
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> Sip-implementors mailing list
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>
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