[SR-Users] Dialog module's keep-alive feature uses wrong CSeq?

[Oded Arbel]

On Mon, Apr 16, 2018, 16:24 Dmitri Savolainen <savolainen at erinaco.ru> wrote:

> Ideally I think Kamailio should send correct (i.e increasing) CSeq numbers.
>>
> in my mind it can't be increased by kamailio because of:
> 1. kamailio send OPTIONS with cseq+1
> 2. media server may send some  indialog reinvite with cseq+1 and then
> kamailio have to remember that OPTIONS and  translate reinvite to cseq+2.
>

Fair point, statelessness is important.


I don't know why for "ka-src" CSeq is 0 and for "ka-dst"  the one
> is  equal: so may be it is possible to be fixed
>

I'll investigate, under the assumption everyone agrees it's a bug.



>  (for example BYE) to be dropped by the firewall.
>
> this may be achieved by
> 1. usrloc pinging
>

I'm not sure that is usrloc pinging, but if you mean nathelper's nat_ping,
then that wouldn't work for me because it's only for MUAs that use
REGISTER, which on my system does not always happen.

2. short re-registration period for endpoint (60 sec for ex)
>

Aside from the fact that REGISTER is not guaranteed to ever happen, this is
also a UA setting that can't be enforced by the server and has serious
implications on battery life outside of a call.

3. let's media server send options by itself via kamailio
>

This may or may not be possible on my setup, I'll have to investigate -
thanks for the suggestion!

-- 

Oded Arbel
oded.arbel at greenfieldtech.net
[image: Greenfield Tech] <http://greenfieldtech.net/>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.kamailio.org/pipermail/sr-users/attachments/20180417/79979bec/attachment.html>