RFC 3261 Section 8.2.6.2 Headers and Tags
-----------------------------------------

Is anyone aware of a reason for the MUST in the following text from RFC
3261:

" 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) "

If the response does not establish a dialog (e.g. 200OK response to
REGISTER request) then what purpose does the tag in the To header serve
?

Should the text be:

" the UAS MUST add a tag to the To header field in the response (with
the exception of the 100 (Trying) response or a final response that does
establish a dialog, in which a tag MAY be present) "

Thanks,

Nigel Smith 



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