Re: [sipcore] Fwd: New Version Notification for draft-sparks-sipcore-refer-clarifications-03.txt
Adam Roach <adam@nostrum.com> Wed, 13 August 2014 15:27 UTC
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Date: Wed, 13 Aug 2014 10:26:59 -0500
From: Adam Roach <adam@nostrum.com>
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To: Ivo Sedlacek <ivo.sedlacek@ericsson.com>, Robert Sparks <rjsparks@nostrum.com>, Andrew Allen <aallen@blackberry.com>, "sipcore@ietf.org" <sipcore@ietf.org>
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Archived-At: http://mailarchive.ietf.org/arch/msg/sipcore/J5VCddYjgr1_byzxgEneBDQoyeg
Subject: Re: [sipcore] Fwd: New Version Notification for draft-sparks-sipcore-refer-clarifications-03.txt
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On 8/13/14 10:03, Ivo Sedlacek wrote: > RFC6665, section 4.5.1, 1st sentence states: > > Notifiers MUST implement the Globally Routable User Agent URI (GRUU) extension defined in [RFC5627], and MUST use a GRUU as their local target. > > Isn't notifier a role taken in subscription, applicable only for the dialog of the subscription? > The UA does not act as notifier in the dialogs created by the particular INVITE request. > Thus, in my reading, the requirement does not apply for the particular INVITE request. > Or do I miss anything? This is exactly what the document that I'll be producing is going to clarify. For what it's worth, "notifier" is defined in section 2 of 6665, and it's not a role. To the point of the specific section you quote, let's look at the whole paragraph: Notifiers MUST implement the Globally Routable User Agent URI (GRUU) extension defined in [RFC5627], and MUST use a GRUU as their local target. This allows subscribers to explicitly target desired devices. Now, take a moment to think really hard about what the second sentence there means. If it's not nonsense or useless noise -- and I assure you that it is not -- then it must be referring to the ability to subscribe to something on a device that the subscriber already knows exists. In order to make that happen, the subscriber must have learned the GRUU some way. How do subscribers learn about GRUUs? It's right there in the first sentence: Notifiers include GRUUs as their local target. We'll come back to this. The use cases that make this interesting are those that involve subscribing to some information about a dialog that you're already in (or were recently in). In fact, not just *any* dialog, but INVITE dialogs. So how does this happen? As I said above: notifers include GRUUs them as their local target. Every time. Including INVITE dialogs. /a
- [sipcore] Fwd: New Version Notification for draft… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Adam Roach
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Andrew Allen
- Re: [sipcore] Fwd: New Version Notification for d… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Christer Holmberg
- Re: [sipcore] Fwd: New Version Notification for d… Adam Roach
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Christer Holmberg
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… OKUMURA Shinji
- Re: [sipcore] Fwd: New Version Notification for d… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Andrew Allen
- Re: [sipcore] Fwd: New Version Notification for d… Andrew Allen
- Re: [sipcore] Fwd: New Version Notification for d… OKUMURA Shinji
- Re: [sipcore] Fwd: New Version Notification for d… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Andrew Allen
- Re: [sipcore] Fwd: New Version Notification for d… Andrew Allen
- Re: [sipcore] Fwd: New Version Notification for d… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Adam Roach
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek
- Re: [sipcore] Fwd: New Version Notification for d… Robert Sparks
- Re: [sipcore] Fwd: New Version Notification for d… Christer Holmberg
- Re: [sipcore] Fwd: New Version Notification for d… Christer Holmberg
- Re: [sipcore] Fwd: New Version Notification for d… Adam Roach
- Re: [sipcore] Fwd: New Version Notification for d… Ivo Sedlacek