Re: [salud] WGLC of draft-ietf-salud-alert-info-urns-09
worley@ariadne.com (Dale R. Worley) Tue, 07 January 2014 20:15 UTC
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To: Paul Kyzivat <pkyzivat@alum.mit.edu>
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Subject: Re: [salud] WGLC of draft-ietf-salud-alert-info-urns-09
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I've been neglecting Salud... > Date: Wed, 20 Nov 2013 15:12:50 -0800 > From: Paul Kyzivat <pkyzivat@alum.mit.edu> My comments on items in this message. (The other items I agree with.) > Section 4: > > Registration date: TBD > > How is this to be filled in? Should there be instructions to the editor? The common method (e.g., draft-cardona-cablelabs-urn-02.txt) seems to be: Registration date: YYYY-MM-DD [RFC Editor: Please replace YYYY- MM-DD with the publication date of this RFC.] > Section 9.2: > > The examples are a [bit] hard to follow. Specifically, each example > describes the signals at each source and the winner, but when doing so > it never mentions which signals (Signal 1, Signal 2, ...) - it instead > identifies by alert urn. Since to point is to determine the signal to be > rendered, this seems obscure. For example the following would seem > clearer to me for 9.2.1: > > If the device receives <urn:alert:source:internal>, then the sort is: > > Signals at source:internal: (this is, first place) > > Signal 2 > > Signals at source: (tied for second place) > > Signal 3 > Signal 4 > Signal 5 > > And these signals are excluded from the set: > > Signal 1 > > So in this example, the sorting algorithm properly gives first place > to Signal 2. Yes, you're right there. I'll rewrite that section and send it in another message. > Section 10: > > A SIP UA MAY add a URN or multiple URNs to the Alert-Info header > field in a SIP request or a provisional 1xx response (excepting a 100 > response) when it needs to provide additional information about the > call or about the provided service. > > The above only talks about adding *to* an Alert-Info, not the adding > *of* an Alert-Info. I suggest: > > A SIP UA MAY include one or more Alert-Info header fields, > containing one or more URNs in a SIP request or a provisional 1xx > response (excepting a 100 response) when it needs to provide > additional information about the call or about the provided service. > > Section 11: > > A SIP proxy MAY add a URN or multiple URNs to the Alert-Info header > field in a SIP request or a provisional 1xx response (excepting a 100 > response) when it needs to provide additional information about the > call or about the provided service. > > I think we would ideally allow a proxy to modify/remove URNs, but 3261 > doesn't permit that. But a proxy can get a similar effect by putting a > counteracting URN earlier in the sequence. But it is also possible that > there will be no Alert-Info and the proxy needs to add one. I suggest: > > A SIP proxy MAY add an Alert-Info header field if none is present, > and MAY add or remove URNs to an Alert-Info header > field in a SIP request or a provisional 1xx response (excepting a 100 > response) when it needs to provide additional information about the > call or about the provided service. There is complexity because we don't really care whether a URN is added to an existing Alert-Info or whether a new Alert-Info is inserted containing the URN. I looked up the terminology in RFC 3261, and it isn't quite what I thought it was: Header Field: A header field is a component of the SIP message header. A header field can appear as one or more header field rows. Header field rows consist of a header field name and zero or more header field values. Multiple header field values on a given header field row are separated by commas. Some header fields can only have a single header field value, and as a result, always appear as a single header field row. Header Field Value: A header field value is a single value; a header field consists of zero or more header field values. (There is no separate definition of "header field row".) So a "header field value" is (in our case) a single URN, a "header field row" is one of those things starting with "Alert-Info:" containing one or more URNs, and the Alert-Info "header field" is the abstract array of all of all the URNs. Also, it seems to be understood that a proxy can reorganize how a header field is split into header field rows, and can reorder how the header field rows for one field name are ordered with respect to the header field rows of another field name. (RFC 3261 section 7.3 and section 16.6 step "copy request") But this is not stated very clearly. Based on that, the first sentences you've listed under section 10 and section 11 are correct, in that we mean that the UA or proxy can add URNs as header field values into the array of header field values, and we don't care how the entity organizes the Alert-Info header field rows as long as the header field is correct. I think it would be clearer to start the sentences: A SIP UA/proxy MAY add one or more URN header field values to the Alert-Info header field ... Do we want to footnote "header field" with "RFC 3261 section 6", which contains the definitions I have quoted? Dale
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Paul Kyzivat
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Laura Liess
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Dale R. Worley
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Laura Liess
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Paul Kyzivat
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Dale R. Worley
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Dale R. Worley
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Laura Liess
- Re: [salud] WGLC of draft-ietf-salud-alert-info-u… Laura Liess
- [salud] Revision of the examples Dale R. Worley
- Re: [salud] Revision of the examples Laura Liess
- Re: [salud] Revision of the examples Dale R. Worley
- Re: [salud] Revision of the examples Laura Liess
- Re: [salud] Revision of the examples Dale R. Worley