[SR-Users] How to drop negative final response and send ACK

Marrold kamailio at marrold.co.uk
Mon Aug 16 18:15:32 CEST 2021

Hi Koray,

I'm glad you mentioned this, I'm currently working on a similar
configuration and tested your scenario and found the same thing. I'm
assuming you're using TSILO?

I just quickly tried this in the failure_route and it appears to be working
but I'm sure there's still some optimisations to be done. It might need
adapting for your situation.

        if ($sht(tsilo=>active_branch::$tU) &&
t_check_status("[456][0-9][0-9]") ) {
                xlog("suspended transaction [$T(id_index):$T(id_label)] $fU
=> $rU\n");
                $sht(tsilo=>suspended::$tU) = "" + $T(id_index) + ":" +

One obvious issue currently is when the mobile client registers it resumes
the suspended transaction and does another look up on the location table,
and then sends a new INVITE to the device that previously rejected the
call. If that's a user that manually rejected a call it will be quite

I'll follow up tomorrow when I've spent more time on this, but hopefully it
gets you started.


On Mon, Aug 16, 2021 at 4:04 PM Koray Vatansever <koray.vatansever at gmail.com>

> Hi,
> I have a problem with the following scenario:
> I have web and mobile sip clients for the same username.
> If both clients are idle, INVITE is forked and both clients ring.
> If web client is busy and mobile client is online and registered, the
> mobile client rings and the caller hears ringback tone.
> If web client is busy and mobile client is offline, before the mobile
> client receives push notification and registers, web client sends 486 busy
> response and caller hears busy tone.
> In this last scenario, I want to wait some time for the mobile client to
> register and ring.
> I tried to drop 486 response in onreply_route[x], but I found that final
> responses cannot be dropped in this route.
> I dropped 486 in reply_route, but I couldn't send an ACK for this
> transaction.
> Is there a way to implement this scenario?
> I would appreciate if you have any suggestions.
> Thanks,
> Koray
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