[SR-Users] SIP contact header question

Jack Davis jackdavis1375 at gmail.com
Tue Mar 14 23:44:41 CET 2017

Thank you for the replies, this has been helpful.

So if I do want to go down this road and want to practically implement a
solution, what is the best method of appending additional record route
headers to a 200 OK response?
I guess, specifically, adding them to the 200 OK response that is given by
kamailio to a re-invite.

Thank you,
Jack Davis

On Tue, Mar 7, 2017 at 3:49 PM, Alex Balashov <abalashov at evaristesys.com>

> On Tue, Mar 07, 2017 at 03:44:31PM -0600, Jack Davis wrote:
> > What kind of problems can arise from inserting said header?
> Theoretically, none. It should be ignored, as per the RFC. Moreover, the
> RFC doesn't _prohibit_ such a header in an in-dialog request, so you are
> probably clear to add it. Fundamentally, ยง 12.2 says:
>    Requests within a dialog MAY contain Record-Route and Contact header
>    fields. However, these requests do not cause the dialog's route set
>    to be modified...
> I have certainly seen instances in the field where RRs in in-dialog
> requests are not ignored, however. That's on the endpoints, of course,
> but it can make things worse.
> > I'm trying to find a way to get a pesky setup to start behaving, of
> course,
> > without requiring them to make any changes.
> That's always a tough gig.
> --
> Alex Balashov | Principal | Evariste Systems LLC
> Tel: +1-706-510-6800 / +1-800-250-5920 (toll-free)
> Web: http://www.evaristesys.com/, http://www.csrpswitch.com/
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