Benny Prijono wrote:
> Paul Kyzivat wrote:
>> 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.)
>
> I think UPDATE can never overlap, because there can only be one
> outstanding offer/answer, cmiiw.
While this is true, and UPDATE need not carry an offer or answer.
Paul
> Good point about CSeq below.
>
> -benny
>
>
>> *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
>
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