Re: [sipcore] draft-sparks-sipcore-multiple-reasons
Robert Sparks <rjsparks@nostrum.com> Sun, 15 May 2022 17:09 UTC
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Date: Sun, 15 May 2022 11:58:57 -0500
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From: Robert Sparks <rjsparks@nostrum.com>
To: Brian Rosen <br@brianrosen.net>, Paul Kyzivat <pkyzivat@alum.mit.edu>
Cc: Christer Holmberg <christer.holmberg@ericsson.com>, "Dale R. Worley" <worley@ariadne.com>, "sipcore@ietf.org" <sipcore@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/sipcore/Pc01nCKPkW7mYq6K8XB2niw5hK0>
Subject: Re: [sipcore] draft-sparks-sipcore-multiple-reasons
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On 5/11/22 9:35 AM, Brian Rosen wrote: > <as individual> > Aha! I was confused. This makes clear what you intended. No harm in > noting the issue in the doc. I would expressly forbid multiple values > in current protocols with a note as to why. I think both of those things are already in 3326? > But just a mention is probably okay with me. > > Brian > > >> On May 11, 2022, at 9:51 AM, Paul Kyzivat <pkyzivat@alum.mit.edu> wrote: >> >> Its clear that this will be the case initially. My question is a >> hypothetical. At some time in the future someone may find a reason >> they want to use multiple reasons with SIP or another pre-existing >> protocol. At that point they might propose an update to allow that >> for SIP. At that point there would be a potential backward >> compatibility problem. >> >> I'm only asking that this document discuss the issue and provide >> guidance for the future. For instance it might ban such changes for >> pre-existing protocols. Or it might just point out that an update to >> allow such for a protocol address the problem as part of the update. >> >> Thanks, >> Paul >> >> On 5/11/22 2:30 AM, Christer Holmberg wrote: >>> I thought the idea was to allow multiple protocols ONLY if the >>> protocol value explicitly allows it (e.g., "STIR"). >>> But, the change would NOT allow multiple instances of "SIP". >>> Regards, >>> Christer >>> -----Original Message----- >>> From: sipcore <sipcore-bounces@ietf.org> On Behalf Of Dale R. Worley >>> Sent: keskiviikko 11. toukokuuta 2022 5.04 >>> To: Paul Kyzivat <pkyzivat@alum.mit.edu> >>> Cc: sipcore@ietf.org >>> Subject: Re: [sipcore] draft-sparks-sipcore-multiple-reasons >>> Paul Kyzivat <pkyzivat@alum.mit.edu> writes: >>>> If an update is made to an existing protocol definition that does >>>> allow multiple reasons, it could break existing implementations. >>> A possible "upward compatibility" mechanism is to retain the >>> requirement that existing protocol names still have only one value, >>> and define a second protocol name to carry the other values that are >>> semantically associated with the existing protocol name. Thus one >>> might have: >>> Reason: SIP ;cause=200 ;text="Call completed elsewhere", >>> SIP-M ;cause=200.1 ;text="Call completed by voicemail", >>> SIP-M ;cause=200.1.17 ;text="Subscriber's voicemail" >>> Older implementations would likely discard both the SIP-M values and >>> process the SIP value as expected. >>> Dale >>> _______________________________________________ >>> sipcore mailing list >>> sipcore@ietf.org >>> https://www.ietf.org/mailman/listinfo/sipcore >> _______________________________________________ >> sipcore mailing list >> sipcore@ietf.org >> https://www.ietf.org/mailman/listinfo/sipcore
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Paul Kyzivat
- [sipcore] draft-sparks-sipcore-multiple-reasons Brian Rosen
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… worley
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Christer Holmberg
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Christer Holmberg
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Paul Kyzivat
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Brian Rosen
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Chris Wendt
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Robert Sparks
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Robert Sparks
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Robert Sparks
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Chris Wendt
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Paul Kyzivat
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Christer Holmberg
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Brian Rosen
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Brian Rosen
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Brian Rosen
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Christer Holmberg
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Mary Barnes
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Paul Kyzivat
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… worley
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Chris Wendt
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Olle E. Johansson
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Ranjit Avasarala
- Re: [sipcore] draft-sparks-sipcore-multiple-reaso… Brian Rosen