Hi Shinji,
I feel your charts seems the same as RFC3311 and O/A draft.
Could you tell us more about your problem?
Thanks,
Gao
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sipping-bounces@xxxxxxxx 写于 2010-04-22 16:23:12:
> Hi all,
>
> At this chance, I want to hear your opinion about the
> interworking of INVITE and UPDATE.
>
> This is related to chapter 4 in a offeranswer draft,
>
> Regarding "5.1 Sending an UPDATE" of RFC3311, Paul said that
> "this language itself is non-normative and is justified as
> a corollary of 3261."
>
> I think so, but these descriptions are also very messy.
> About the timing when UA can send an UPDATE request,
> at last I think as the following,
>
> A B
> *| |*
> *|ini/re-INVITE(offer) |*
> |------------------------------>|
> | 1xx-rel(answer)|
> |<------------------------------|
> |PRACK |
> |------------------------------>|
> | 200(PRACK)|
> |<------------------------------|
> *| |*<-- after this pont, UA may
> *| |* send UPDATE with offer
> *| |*
>
> A B
> *| |*
> *|ini/re-INVITE(no offer) |*
> |------------------------------>|
> | 1xx-rel(offer)|
> |<------------------------------|
> |PRACK(answer) |
> |------------------------------>|
> | 200(PRACK)|
> |<------------------------------|
> *| |*<-- after this pont, UA may
> *| |* send UPDATE with offer
> *| |*
>
> Do you have any questions or comments?
>
> Regards,
> Shinji
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