Re: [Sipping] interworking(1/2) of INVITE and UPDATE

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Hi,


> This is one of the figures in my proposals.
>
>        A                               B
>        |                               |
>        |                re-INV (offer0)|
>        |<------------------------------|
>        |1xx-rel (answer0)              |
>        |------------------------------>| --+
>        |offer1(UPD)         offer2(PRA)| M2| Acknowledge
>     M1 |============\  /===============| <-+
>        |             \/                |
>        |             /\                |
>        |<===========/  \==============>|
>        |                      491 (UPD)|
>        |<------------------------------|
>        |                               |
>
> If the INVITE is an intial INVITE, UA A can not send this UPDATE.


Yes. There's no such consistency for Ini-INVITE and Re-INVITE.

>
> >>
> >> 2. Section 5.1 seems to say that the timing UA may send UPDATE
> >>    is "after sending or receiving PRACK request". But I think it
> >>    should be "PRACK transaction is completed".
> >>    Because "after-PRACK-request" cause a glare case.
> >>
> >> Do you agree?
> >
> >I think timing of "PRACK transaction is completed" is better.
> >
> >But it seams that there's no problem for UAS sending UPDATE just after
> >receiving PRACK(with out SDP).
> >If PRACK has SDP, then UAS should not send the UPDATE by O/A rules.
>
> This is another one of the figures in my proposals.
>
>                    A                               B
>                    |                               |
>                    |              re-INV (no offer)|
>    1st reliable+-- |<------------------------------|
>    response    | M1|1xx-rel (offer1)               |
>                +-> |==============================>| --+
>                    |                   answer1(PRA)| M3| Acknowledge
>                    |<===========\  /===============| <-+
>                    |             \/                |
>                    |             /\     offer2(UPD)|
>                    |<===========/  \===============| M2
>                    |500 (UPD)                      |
>                    |------------------------------>|
>                    |2xx-PRA                        |
>                    |------------------------------>|
>                    |                               |
>
> This is a message crossing case.


The 500 is always with retry. So, B could re-send the UPDATE later.

But, I am not oppose to the clarification or fixing you suggested.

Thanks,

Gao


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