Re: configuration NOTIFY in example 9.1 of outbound i-d

Dean Willis wrote:
> 
> 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?

Sure. When the translation of the gruu takes place the contact, with the 
ob param, will go in the R-URI. And then of course that influences how 
it is routed.

> 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.

Yes, I think you are right. The UA needs to either use a contact with 
'ob', or a gruu that maps to a contact with 'ob'.

	Thanks,
	Paul

> -- 
> Dean
> 
> 
> 
> 
> 
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