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

[Paul Kyzivat <[e-mail]>]

I guess our replies overlapped.

Francois Audet wrote:
> 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.

Not quite. If you have obtained a gruu after registering a contact with 
outbound, you don't have to put "ob" on the gruu. It wouldn't help, 
since it would get lost in the process of translating the gruu.

	Thanks,
	Paul

> 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:[e-mail]] 
>> Sent: Thursday, October 02, 2008 15:56
>> To: Paul Kyzivat
>> Cc: Audet, Francois (SC100:3055); Cullen Jennings; Rohan 
>> Mahy; [e-mail]
>> 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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