Re: [Sip] Re: Outbound: Feature Tag (Ab)Use

[Rohan Mahy <[e-mail]>]

Hi Jeroen,

In outbound-11, the UAC includes the 'ob' parameter in its Contact in  
dialog-forming requests if it wants the first-hop to Record-Route  
with a flow token. This language is flexible enough that it allows an  
implementation to use a GRUU in its contact instead (once it has  
one), to implement outbound without GRUU, and to send an initial  
SUBSCRIBE for the SIP config event package before registration.

I believe this addresses your comment.

thanks,
-rohan


On Jul 20, 2007, at 11:45 AM, Jeroen van Bemmel wrote:

> Rohan,
>
> The flag is needed, but you could make it a header parameter rather  
> than a URI parameter (both for Contact and for Path).
>
> There is no need for it to appear in the request URI of mid-dialog  
> requests. The EP can use its own convention to encode the flag, due  
> to things like GRUU it cannot rely on the 'ob' parameter being in  
> the request URI anyway.
>
> Regards,
> Jeroen
>
> Rohan Mahy wrote:
>> On Jul 20, 2007, at 9:06 AM, Rohan Mahy wrote:
>>
>>> Hi Adam,
>>>
>>> What can I say but "You're right".  Unless there is some
>>> fundamental objection, I will make this change pronto to my working
>>> copy.
>>>
>>> I believe this also means I can remove the 'ob' parameter from the
>>> UAC's Contact header.
>>
>> On further thought, I realized that the 'ob' parameter is still
>> needed, since it reflects whether the UAC is sending over a flow for
>> which out bound processing is being applied, as opposed to merely
>> indicating the UAC is capable of requesting outbound.
>>
>> thanks,
>> -rohan
>>



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