Re: multihoming & BYEs

Just to add here, double rr with putting the interface details in them
using the record_route_preset (
https://www.kamailio.org/docs/modules/devel/modules/rr.html#rr.f.record_route_preset)
might be the way to go here.

This will allow the BYE to have the correct routes to get back out
hopefully.

So on initial invite from private: in rr header 1st rr is from public, 2nd
rr is private
and on initial invite from public: in rr header 1st rr is from private, 2nd
rr is public

This orders the rr headers so on the way back they come in correctly if
that makes sense.

I do this at the initial Invite and it works fine for me, but your mileage
may vary.

Hope this helps,

John.



On Tue, 24 Jun 2025 at 10:25, Sergei Safarov via sr-users <
[email protected]> wrote:

> Will be fine to check SIP messages.
> Here is important Route, Record-Route and contact header values.
>
> Sergey.
>
> On Mon, 2025-06-23 at 20:24 -0500, Dustin Marquess via sr-users wrote:
>
> All,
>
> I've tried searching and have found similar posts before, but I have yet
> to find a real 'solution'.
>
> I'm running Kamailio 6.0.1 & RTPEngine 13.3.1.7 (on a Linux VM)  as a
> "SBC" (at home) using the config from:
>
> https://github.com/voiceboys/sbcOS/blob/version_2.0/var/www/html/alpine/config/a0%3A36%3A9f%3Ae7%3A6a%3Ae2/etc/kamailio/kamailio.cfg
>
> Except that I've added the following:
>
> mhomed=1
> modparam("rr", "force_send_socket", 1)
>
> The SBC is dual-homed: one interface on the local LAN and another
> interface directly on the Internet/WAN (real public IP).
>
> Everything works fine, EXCEPT if the remote end (the side on the
> WAN/Internet) hangs up first. If they do, the BYE never makes it past
> Kamailio to the local PBX and/or phone.
>
>
> https://users.openser.narkive.com/1aK7n8Il/sr-multihomed-kamailio-and-enable-double-rr#post8 suggests
> to use $sht to save the information needed, but I have no clue where in the
> config to put that.
>
> Any help would be greatly appreciated.
>
> Thanks!
>
> -Dustin
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