Re: [Stox] Comments on draft-ietf-stox-presence-00
Michael Lundberg <michaellundberg.ietf@gmail.com> Thu, 01 August 2013 01:18 UTC
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Date: Wed, 31 Jul 2013 21:17:57 -0400
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From: Michael Lundberg <michaellundberg.ietf@gmail.com>
To: Peter Saint-Andre <stpeter@stpeter.im>
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Subject: Re: [Stox] Comments on draft-ietf-stox-presence-00
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Peter, The suggest text below makes sense to me. In my opinion, this helps more clearly defining the presence mapping from XMPP to SIP for values such as 'away'. I think there needs to be similar text for the second table (currently labeled Table 6), which states that the gateway SHOULD map the <show xmlns='jabber:client'> element in the PIDF XML to the <show/> element in the XMPP presence stanza. This would only be for SIP clients that support that particular namespace, but it at least provides a recommended mapping in the opposite direction for clients that do support that namespace. ~Michael On Mon, Jul 29, 2013 at 6:49 AM, Peter Saint-Andre <stpeter@stpeter.im> wrote: > On 7/26/13 5:55 PM, Peter Saint-Andre wrote: >> On 7/26/13 4:50 PM, Michael Lundberg wrote: >> >>> One clarifying question: when you say "if the SIP implementation >>> supports the namespace", do you mean the XMPP-to-SIP gateway or the >>> SIP user agent? >>> >>>> Good question. It would be benificial if both supported the >>>> namespace, but only the gateway is probably required to. If the >>>> client supports the namespace, then the gateway would just need to map >>>> between the elements described in this document. >>> >>>> If the client doesn't support the namespace, the gateway would most >>>> likely need to do an additional translation into a namespace the >>>> client does understand. In this case, the values might not be the >>>> same between the two namespaces, and therefore things are 'lost' in >>>> translation. This is one of the big issues with presence mapping today >>>> as many implementations have thier own implementation specific >>>> namespace, which makes it hard to map between different >>>> implementations. Both the implementation specific and common >>>> namespaces could coexist, where the implementation specific namespace >>>> is used for internal communication and a common, standard namespace >>>> (e.g., 'jabber:client' ) is used when communicating between different >>>> implementations. >> >> Yes, I think that makes sense. I'm not sure exactly how to translate >> that into text (especially the part about proprietary / non-standard >> namespaces), but I'll work something up for consideration by the list. > > Here is some proposed text: > > OLD > 5. Some implementations support custom extensions to encapsulate > this information; however, there is no need to standardize a PIDF > extension for this purpose, since PIDF is already extensible and > thus the <show/> element can be included directly, qualified by > the 'jabber:client' namespace in the PIDF XML. The examples in > this document illustrate this usage, which is RECOMMENDED. The > most useful values are likely "away" and "dnd", although note > that the latter value merely means "busy" and does not imply that > a server or client ought to block incoming traffic while the user > is in that state. > > NEW > 5. Some implementations support custom extensions to encapsulate > detailed information about availability; however, there is no > need to standardize a PIDF extension for this purpose, since > PIDF is already extensible and thus the <show/> element > (qualified by the 'jabber:client' namespace) can be included > directly in the PIDF XML. The examples in this document > illustrate this usage, which is RECOMMENDED. The most useful > values are likely "away" and "dnd", although note that the > latter value merely means "busy" and does not imply that a > server or client ought to block incoming traffic while the user > is in that state. Naturally, a gateway can choose to translate > a custom extension into an established value of the <show/> > element [RFC6121], or translate a <show/> element into a custom > extension that the gateway knows is supported by the user agent > of the intended recipient. Unfortunately, this behavior does > not guarantee that information will not be lost; to help prevent > information loss, a gateway ought to include both the <show/> > element and the custom extension if the gateway cannot suitably > translate the custom value into a <show/> value. > > Mike, does that text address your concern? Do we need to say more (or > less) than that? > > Peter > > -- > Peter Saint-Andre > https://stpeter.im/ > >
- [Stox] Comments on draft-ietf-stox-presence-00 Michael Lundberg
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Peter Saint-Andre
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Michael Lundberg
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Peter Saint-Andre
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Peter Saint-Andre
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Michael Lundberg
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Peter Saint-Andre
- Re: [Stox] Comments on draft-ietf-stox-presence-00 Peter Saint-Andre