One thing was not mentioned by other responders:
when you send a SUBSCRIBE, it may be forked. If one fork returns a 2xx,
then other 2xx responses will be dropped by the forking proxy. However,
for other forks that did respond with a 2xx, a NOTIFY may arrive. It
will be in the context of a dialog known to the sender but not to the
receiver. The recipient of such a NOTIFY is expected to establish a
dialog as a result. Subsequent NOTIFYs by the same sender will be within
that dialog.
Paul
Tatha wrote:
> Hi,
>
>
>
> I have a doubt regarding the SIP NOTIFY msgs.
>
> My idea about NOTIFY msg is, in general when a party SUBSCRIBE for some
> event and he's notified by the Notifier that NOTIFY msg would be an
> in-dialog msg i.e would have the same dialog id as that of the SUBSCRIBE.
>
> But is there a case in which the NOTIFY msg can be a out of dialog one as
> well?
>
>
>
> Regds.
>
> Tatha
>
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