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List:       sip-implementors
Subject:    RE: [Sip-implementors] Use of tags in responses
From:       hisham.khartabil () nokia ! com
Date:       2002-05-24 11:32:48
Message-ID: 2038BCC78B1AD641891A0D1AE133DBB77791EA () esebe019 ! NOE ! Nokia ! com
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This looks like an error in the example.

If you think you found an error in the SIP spec, you should send the email to the sip mailing list.

Regards,
Hisham

> -----Original Message-----
> From: Leinonen Mika.P (NMP/Oulu) 
> Sent: Friday, May 24, 2002 2:14 PM
> To: sip-implementors@cs.columbia.edu
> Subject: [Sip-implementors] Use of tags in responses
> 
> 
> Hi,
> 
> I have been checking the generation of tags to the To header 
> field in response messages, since I noticed that the example 
> of the REGISTER response in bis-09 does not have it, while 
> the example of the response to OPTIONS does include it.
> 
> Chapter 8.2.6.2 of bis-09 says the following:
> However, if the To header field in the request did not 
> contain a tag, the URI in the To header field in the response 
> MUST equal the URI in the To header field; additionally, the 
> UAS MUST add a tag to the To header field in the response 
> (with the exception of the 100 (Trying) response, in which a 
> tag MAY be present).
> 
> Does this in fact only concern the cases where the response 
> (provisional or final) establishes a dialog? And for the 
> responses that do not (non-successful responses to requests 
> that initiate dialogs as well as successful responses to 
> requests that do not), tag in the To header of the response 
> is not needed? If the tag may or may not be there if the 
> response does not establish a dialog then maybe 8.2.6.2 could 
> be clarified? Or is the tag just missing from the REGISTER 
> response example? Or is REGISTER some kind of special case 
> that escaped me?
> 
> Br,
> 	-Mika
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