Thanks for this. And thanks Sanjay for moving it to the appropriate 
mailing list!

Paul Kyzivat wrote:
> 
> Sanjay Sinha (sanjsinh) wrote:
> 
>>I think it will send 200 OK to CANCEL first, to let UAC know that it has
>>received it, and then act on Cancel request and send 487 for Invite.
> 
> 
> Note that even if they are sent in that order they may not be *received* 
> in that order.
> 
>       Paul
> 
> 
>>Sanjay
>>
>>PS: I moved this to sip-implementors, where it's more appropriate. 
>>
>>
>>>-----Original Message-----
>>>From: Stephen McVarnock [mailto:[EMAIL PROTECTED] 
>>>Sent: Tuesday, May 15, 2007 9:58 AM
>>>To: [EMAIL PROTECTED]
>>>Subject: [Sip] UAS behaviour in response to a CANCEL request
>>>
>>>Hi folks,
>>>    If a UAC sends a CANCEL request to the UAS, is the UAS 
>>>under any obligation for the order in which it sends it's 
>>>responses? i.e.:-
>>>
>>>It must send the 200 OK for the CANCEL before it sends the 487 
>>>for the INVITE request.
>>>
>>>or
>>>
>>>It must send the 487 to the INVITE before it sends the 200 OK 
>>>for the CANCEL request.
>>>
>>>Having a look at section 9 of RFC 3261, it makes no mention of 
>>>this which I assume implies that either situation should be 
>>>dealt is acceptable.
>>>
>>>Thanks in advance for any help supplied.
>>>
>>>Regards,
>>>   Steve
>>>
>>>
>>>
>>>-- 
>>>
>>>
>>>***********************************************************************
>>>* Stephen McVarnock         * Email: [EMAIL PROTECTED]     *
>>>* Senior Software Developer * WWW  : http://www.aepona.com            *
>>>* Aepona Ltd.,              * Phone: +44 (0)28 9026 9114              *
>>>* Interpoint Building,      * Fax  : +44 (0)28 9026 9111              *
>>>* 20-24 York Street,        *                                         *
>>>* Belfast. BT15 1AQ         *                                         *
>>>* N. Ireland                *                                         *
>>>***********************************************************************
>>>
>>>
>>>
>>>_______________________________________________
>>>Sip mailing list  https://www1.ietf.org/mailman/listinfo/sip
>>>This list is for NEW development of the core SIP Protocol Use 
>>>sip-implementors@cs.columbia.edu for questions on current sip 
>>>Use [EMAIL PROTECTED] for new developments on the application of sip
>>>
>>
>>_______________________________________________
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>>Sip-implementors@cs.columbia.edu
>>https://lists.cs.columbia.edu/cucslists/listinfo/sip-implementors
>>
> 
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-- 


***********************************************************************
* Stephen McVarnock         * Email: [EMAIL PROTECTED]     *
* Senior Software Developer * WWW  : http://www.aepona.com            *
* Aepona Ltd.,              * Phone: +44 (0)28 9026 9114              *
* Interpoint Building,      * Fax  : +44 (0)28 9026 9111              *
* 20-24 York Street,        *                                         *
* Belfast. BT15 1AQ         *                                         *
* N. Ireland                *                                         *
***********************************************************************

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