Iñaki,
I don't think anyone is saying that you must implement your UAC to use
this capability. If your UAC has nothing where this is useful then it
need not bother.
But your UAS and Proxy should support it. And its not like its any huge
burden to do so. Others see value in this, and if they decide to use it
they should not be disappointed by your servers.
Thanks,
Paul
Iñaki Baz Castillo wrote:
> El Lunes 06 Abril 2009, Brett Tate escribió:
>
>> The following is a non service example.
>>
>> B2BUA aware of Session-Expires activated upon early dialog by UPDATE.
>> B2BUA does not receive refresh in time; it sends BYE towards called party
>> for 1 of multiple early dialogs for branch.
>
> Yes, in theory it can be implemented since it's written :)
> That's why I insist on "real" implementations :)
>
>
>>> since RFC3261 is not strict about the need of Contact and RR headers
>>> in 1XX responses, we cannot expect sending an in-dialog request (BYE)
>>> during an early-dialog to work.
>> If I recall correctly (sorry no time dig up references), RFC 3261 is strict
>> about adding Contact although it may be hidden within the text. The To tag
>> is required to form a dialog; Contact is required to be included within
>> dialog forming responses.
>
> Yes, but RFC 3261 states that Contact is required in reliable responses, and
> according to RFC 3261 1XX are not reliable.
> I remember a long thread about it and it was clear that... it wasn't clear :)
>
> In fact I've seen lots of implementations not adding Contact and RR in 1XX
> responses.
>
> Regards.
>
>
>
>
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