Re: New text for ua-privacy

John,

See inline.

 > I previously commented on the last sentence of the following text in
 > 5.1.1 (Contact header field) of draft-ietf-sip-ua-privacy-05:
 > "   When using this header field in a dialog-forming request or response
 >    or in a mid-dialog request or response, the user agent MUST anonymize
 >    the Contact header field using an anonymous URI ("temp-gruu")
 >    obtained through the GRUU mechanism, unless an equivalent functional
 >    anonymous URI is provided by some other means.  For out-of-dialog
 >    request, anonymous URI MAY be set when anonymization is required."
 >
 > The reason for my comment was that I wasn't certain where the last
 > sentence would apply.

The original intent of the sentence was to anonymize
the Contact except for the REGISTER requests and 3xx
responses, as you pointed out in November, but I agree
that it is hard to tell from the current sentence.

 >
 > Of course, a REGISTER request or 200 response is "out of dialog", but
 > clearly an anonymized Contact URI is inappropriate.
 >
 > In addition I have identified the following requests:
 > - OPTIONS - Contact MAY be included.
 > - PUBLISH - Contact, if present, doesn't have any meaning in the context
 > of event publication.
 > - MESSAGE - Contact not allowed.

The Contact header is not allowed in PUBLISH request,
I believe.  Therefore, the Contact in OPTIONS is the
only case we should care as out-of-dialog request.

 >
 > Furthermore, non-dialog-forming responses to things like INVITE and
 > SUBSCRIBE do not require Contact, with the exception of 3xx where the
 > URI clearly cannot be anonymized.
 >
 > So how to cover this concisely? I would propose replacing the last
 > sentence above with the following:
 >
 > "For other requests and responses, with the exception of 3xx responses,
 > REGISTER requests and REGISTER 200 responses, the UA MUST either omit
 > the Contact header field or use an anonymous URI."
 >
 > Would this be acceptable? Have I captured all exceptions?

This text is much clearer than the original text.
I think this captures all the exceptions.
If there is no more exceptions, I will replace
the last sentence with your text.

Thank you!

Mayumi


 >
 > John
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 >
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