Re: Possible improvement in draft-ietf-sipcore-invfix (CANCEL processing)

2010/5/24 Christer Holmberg <[email protected]>:
>
> Hi,
>
> My understanding is that 200 OK for the CANCEL only means "Ok, I got the request".
>
> It is the INVITE response that matters. If the INVITE transaction was cancelled, the UAC would not have received a 200 OK for the INVITE.


Hi, let me re-explain my example (assuming the proxy implements invfix draft:


- alice sends INVITE to the proxy.
- The proxy relays it to bob.
- bob replies 200.
- The proxy relays the 200 to alice. The INVITE transaction in the
proxy remains in "Accepted" state (invfix addition).
- alice sends now a CANCEL (before receiving the 200 for the INVITE).
- The proxy receives the CANCEL and matches the existing INVITE
transaction (in "Accepted" state), what should it reply? "200
Canceled"? there is nothing to cancel right now as a 200 was already
received by the proxy.


-- 
Iñaki Baz Castillo
<[email protected]>
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