[SIPForum-discussion] Which should be the correct behaviour?

[Robert Sparks]

Its hard to tell from the attachment (a text description would be more  
list friendly), but I think you're asking
whether or not you are supposed to get both a 200 to the CANCEL and a  
final response to the INVITE at the
originating phone? If that is your question, the answer is yes.

CANCEL is a discrete transaction. It _always_ gets its own final  
response.

Some other related notes for the list at large (since these questions  
usually show up on this list in a swarm)
* CANCEL is a hop-by-hop transaction - The CANCEL and its final  
response will only have one Via header field (unless you have - 
 >stateless<- proxies, but you probably don't).
* The 200 OK to the CANCEL does not mean the request has been  
cancelled. It means the next hop  received the CANCEL request, has  
found the transaction to cancel and is willing to try. You learn  
whether or not the INVITE got cancelled in the final response to the  
INVITE. (If it was successfully cancelled, you'll see a 487 to the  
INVITE).

RjS

On Apr 2, 2008, at 7:31 AM, Andrea Puddu wrote:

>
>
> Sorry guys, my results were not correct because I have tried to use  
> a simulator.
> Attached you can find a comparison between two different phones in  
> the second scenario in a real case.
> I guess that the first behaviour is not correct, isn't it?
>
> Thanks everybody very much,
>
> Andrea
>
>
> From: androjoker at hotmail.com
> To: discussion at sipforum.org
> Date: Fri, 28 Mar 2008 11:10:21 +0000
> Subject: [SIPForum-discussion] Which should be the correct behaviour?
>
> Hello,
>
> does anybody know which should be the correct phone behaviour in  
> these two scenarios?
> -          Scenario 1:
> SIP phone sends an INVITE (D1)
> SIP phone sends a CANCEL (C1)
> SIP phone receives C1 200 OK
> SIP phone receives D1 200 OK
>
> -          Scenario 2:
> SIP phone sends an INVITE (D1)
> SIP phone sends a CANCEL (C1)
> SIP phone DOES NOT receive C1 200 OK
> SIP phone receives D1 200 OK
>
> Thanks,
>
> Andrea
>
>
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