Dima Polsky wrote:
> Hi,
>
> What requests are allowed to overlap (several concurrent requests with
> the same dialog id) ? I know that for MESSAGE, INVITE and UPDATE it is
> forbidden, what about INFO, NOTIFY?
I'm not sure about INFO, but overlap is allowed for NOTIFY. Furthermore,
messages belonging to different usages of the same dialog can overlap -
e.g. UPDATE and NOTIFY. (Assuming you have multiple usages in the dialog.)
*BUT* overlapping has the potential to get you into trouble except in a
few specific cases. The problem is that if the messages get reordered
before delivery, then when the second one arrives it will be seen as
having a CSeq that is too small, and so will fail. In some limited cases
this may be ok. In particular, if you have an event package where each
new NOTIFY supercedes the prior one, then all may be well. In all other
cases it will be a problem.
So in practice it may really be necessary to serialize most messages in
a dialog.
Paul
> Best Regards
>
> Polsky Dima
>
>
>
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