[sr-dev] ideas on dialog spiral distinction

[Jason Penton]

OK Klaus,

that makes sense to me now!! Thank you. Let me try that.

Cheers
Jason

On Thu, Aug 25, 2011 at 10:31 AM, Klaus Darilion <
klaus.mailinglists at pernau.at> wrote:

>
>
> Am 25.08.2011 10:14, schrieb Jason Penton:
> >
> > From some initial work and testing I can confirm that this works ONLY
> > when using the top Via *without* branch tags. Not sure what impact this
> > could have?
> > This is because a BYE results in a different set of branch tags from the
> > original set of invite branches - I am investigating why and how this
> > works now.
>
> Sure. the branch tag is a transaction identifier and must be unique in
> space and time. Thus, BYE must have another tag. That's why I said you
> have to put some data into RR cookies - this is the only data which
> stays the same during the dialog (except tags and call-id).
>
> If you only want to know if an in-dialog request is from orig->term or
> from term->orig, then the is_direction function is already sufficient.
>
> If you want to detect a certain spiral leg in dialog module, IMO you
> have to add another matching parameter (besides tags and call-id) to
> dialog module which will be set as RR-cookie and retrieved from Route
> header for in-dialog requests. Every time the initial requests spirals
> through the proxy, you have to add such a cookie which of course must be
> different to the previous inserted cookie (therefore ftag is not
> sufficient anymore) - either generate a random identifier or reuse some
> data from the message (e.g. you could copy branch-tag to RR header as it
> should be unique)
>
> regards
> Klaus
>
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