Re: [sipcore] Reason as a parameter rather than an escaped header
Hadriel Kaplan <HKaplan@acmepacket.com> Fri, 10 December 2010 16:45 UTC
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From: Hadriel Kaplan <HKaplan@acmepacket.com>
To: Mary Barnes <mary.ietf.barnes@gmail.com>
Date: Fri, 10 Dec 2010 11:46:53 -0500
Thread-Topic: [sipcore] Reason as a parameter rather than an escaped header
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Cc: "sipcore@ietf.org WG" <sipcore@ietf.org>
Subject: Re: [sipcore] Reason as a parameter rather than an escaped header
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OK, so I think there's general agreement to add additional H-I header fields for internal retargeting. I have two questions then: 1) the text below says: "For retargets as a result of timeouts or internal events, a Reason MAY be associated with the hi-targeted-to-uri that has been retargeted." Why is this a MAY? What's the alternative? Does it mean they may do something else, like use a RFC 4458 style cause URI parameter? Does it mean they may associate it with a different hi-targeted-to-uri? (I assume not, but the text isn't clear) For example, is this what you really want to say: "For retargets as a result of timeouts or internal events, a Reason MUST be associated with the hi-targeted-to-uri that has been retargeted and encoded as an embedded Reason header field in the URI, unless the reason for the retargeting is unknown." 2) What form of reason-value protocol can be used for a Reason from an internal operation? Can it be a "SIP" cause? Ultimately if this info is used by a receiver of the H-I entries to trigger different behavior/features, it would be really nice not to have to create a bunch more values that the receiver would have to understand/support. -hadriel On Dec 6, 2010, at 10:38 AM, Mary Barnes wrote: Hi Marianne et al, I totally agree that there was some text removed from RFC 4244 that was intended to handle the internal retargeting case. I would suggest we add that back, updating the paragraph to be a little more concise as I suggested earlier in the thread and add a note with regards the definition of any new Reason headers - something like the following: If the response contains any Reason header fields, then the Reason header fields MUST be captured as Reasons associated with the hi-targeted-to-uri that has been retargeted. If the SIP response does not include a Reason header field (see [RFC3326]), the SIP Response Code that triggered the retargeting MUST be included as the Reason associated with the hi-targeted-to-uri that has been retargeted. For retargets as a result of timeouts or internal events, a Reason MAY be associated with the hi-targeted-to-uri that has been retargeted. [MB: this is the original text from RFC 4244.] In the case that additional Reason headers are defined, per RFC 3326, the use of these Reason headers for the History-Info header field MUST follow the same rules as described above. Thanks, Mary. On Thu, Nov 25, 2010 at 4:33 PM, <marianne.mohali@orange-ftgroup.com<mailto:marianne.mohali@orange-ftgroup.com>> wrote: Hi, I agree that draft-mohali-sipcore-reason-extension-application could live independently of 4244bis, except for the section "Reason in the History-Info header" that should still allow wat is proposed in draft-reason. Note that RFC4244 is compatible with the draft-reason proposal: As work on 4244bis was in progress, we based the draft on the following text from RFC4244: "For retargets as a result of timeouts or internal events, a Reason MAY be associated with the hi-targeted-to-uri that has been retargeted." Unfortunately, this sentence disappeared and only the last sentence about timeout suggests to insert a Reason for an internal process. If there is no objection, we could put this text back in 4244bis to keep explicit the ability to insert the Reason header field in a H-I entry for *internal* reasons (with a MAY). Regards, Marianne > -----Message d'origine----- > De : sipcore-bounces@ietf.org<mailto:sipcore-bounces@ietf.org> > [mailto:sipcore-bounces@ietf.org<mailto:sipcore-bounces@ietf.org>] De la part de Christer Holmberg > Envoyé : jeudi 25 novembre 2010 07:48 > À : Paul Kyzivat > Cc : Worley, Dale R (Dale); sipcore@ietf.org<mailto:sipcore@ietf.org> > Objet : Re: [sipcore] Reason as a parameter rather than an > escaped header > > > Hi, > > >>I think we should ask ourselves: assuming we allowed to do what > >>Marianne is proposing, would anything break? > >> > >>Does anyone really care whether a H-I entry was inserted based on a > >>"real" or "virtual" response? Aren't people more interested in the > >>actual reason value? > > > >I don't currently see a problem with permitting this (though I'm > >interested to hear if somebody else sees an issue). > > > >But IMO the current text doesn't suggest to me that this is valid. > >So if the desire is for it to be valid it would be good to have some > >text that makes it so. > > I agree. We would need to add some text. > > Regards, > > Christer > > _______________________________________________ > sipcore mailing list > sipcore@ietf.org<mailto:sipcore@ietf.org> > https://www.ietf.org/mailman/listinfo/sipcore > _______________________________________________ sipcore mailing list sipcore@ietf.org<mailto:sipcore@ietf.org> https://www.ietf.org/mailman/listinfo/sipcore <ATT00001..c>
- Re: [sipcore] Reason as a parameter rather than a… Paul Kyzivat
- [sipcore] Reason as a parameter rather than an es… Worley, Dale R (Dale)
- Re: [sipcore] Reason as a parameter rather than a… Worley, Dale R (Dale)
- Re: [sipcore] Reason as a parameter rather than a… Mary Barnes
- Re: [sipcore] Reason as a parameter rather than a… Paul Kyzivat
- Re: [sipcore] Reason as a parameter rather than a… Christer Holmberg
- Re: [sipcore] Reason as a parameter rather than a… Paul Kyzivat
- Re: [sipcore] Reason as a parameter rather than a… Christer Holmberg
- Re: [sipcore] Reason as a parameter rather than a… Hadriel Kaplan
- Re: [sipcore] Reason as a parameter rather than a… marianne.mohali
- Re: [sipcore] Reason as a parameter rather than a… marianne.mohali
- Re: [sipcore] Reason as a parameter rather than a… R.Jesske
- Re: [sipcore] Reason as a parameter rather than a… Paul Kyzivat
- Re: [sipcore] Reason as a parameter rather than a… Mary Barnes
- Re: [sipcore] Reason as a parameter rather than a… marianne.mohali
- Re: [sipcore] Reason as a parameter rather than a… Hadriel Kaplan
- Re: [sipcore] Reason as a parameter rather than a… R.Jesske
- Re: [sipcore] Reason as a parameter rather than a… marianne.mohali