Re: [Sip] Interesting problem with PRACK and resent INVITEs

On Jan 17, 2008 8:23 PM,  <Dale.Worley@comcast.net> wrote:
> Since the PRACK F5 is sent within a forked dialog, we don't think of
> it as using up CSeq number space in the space of out-of-dialog
> requests.  So when it comes time to re-send the INVITE F13, it's easy
> to think that you can just use a CSeq one higher than the original
> INVITE F1.  But transaction processing at UAS 1 is likely to notice
> that it's already seen CSeq 2 with that Call-Id.  It looks like one
> must make sure that the re-sent INVITE has a CSeq higher than has been

Dale,

Surely there is no dialog for the INVITE in F14 to be interpreted in
between UAC and UAS1 when it arrives as UAS1, as the previous 487 (F9)
would have terminated the dialog?

 ~ Theo

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