My take on this is that Juha is right and the document should really say:
If the UAC is sending a dialog-forming request, and wants all
subsequent requests in the dialog to arrive over the same
flow, the UAC MUST add an 'ob' parameter to its Contact header.
[ DELETE NEXT SENTENCE ENTIRELY ]
In other words, GRUU is orthogonal and does NOT imply "ob" behavior.
Clean and simple, and I *think* this was our intent (i.e., I think
this is an historical oversight).
Cullen, can you confirm or clarify?
> -----Original Message-----
> From: Dean Willis [mailto:[EMAIL PROTECTED]
> Sent: Thursday, October 02, 2008 15:56
> To: Paul Kyzivat
> Cc: Audet, Francois (SC100:3055); Cullen Jennings; Rohan
> Mahy; [email protected]
> Subject: Re: [Sip] configuration NOTIFY in example 9.1 of outbound i-d
>
>
> On Sep 29, 2008, at 3:26 PM, Paul Kyzivat wrote:
>
> >
> >
> > Francois Audet wrote:
> >>> > Section 4.3 states (UA procedures):
> >>> > If the UAC is sending a dialog-forming request, and wants all
> >>> > subsequent requests in the dialog to arrive over the same
> >>> flow, the
> >>> > UAC adds an 'ob' parameter to its Contact header. Typically
> >>> this is
> >>> > desirable, but it is not necessary for example if the Contact
> >>> is a
> >>> > GRUU [I-D.ietf-sip-gruu].
> >>> if contact is gruu, does it mean that 'ob' param is implicitly
> >>> included?
> >> I am not sure why this is worded like this. I was thinking
> that using
> >> a GRUU as a contact in a dialog-forming request would mandate that
> >> requests sent to that Contact would be sent using the same
> flow, but
> >> I see no such rule in draft-ietf-sip-gruu.
> >
> > Gruu isn't dependent on outbound.
> >
> >
>
> So explain this one for me, please.
>
> Is it that, if the gruu was formed using outbound (that is,
> the "real"
> contact for which the gruu is an alias has an "ob") use of
> the gruu will use the "ob" in the dereferencing at the gruu-provider?
>
> So for the example referenced above may be correct, but
> incomplete -- it should talk about whether or not the gruu
> was formed using outbound, not just whether or not the
> contact isa gruu.
>
> --
> Dean
>
>
>
>
>
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