[SR-Users] Clients are busy

[Daniel Tryba]

On Fri, May 06, 2016 at 07:13:19AM +0000, kai.ohnacker at cbc.de wrote:
> in my scenario works multiple user with the kamailio server and uses
> different clients. They work in a mobile scenario and setup the
> clients and break the clients in a high period. If they break the
> clients, sometimes they don't send a bye, but they take off the cable
> connection during a call.  If these devices will connected again and
> other clients try to call them, they are busy.

Who is generating this busy? Kamailio ("default" config) normally
doesn't care.

> That is my problem :).
> Does the Kamailio server provides any function to send a bye message
> if  a clients don't register at a required time? Or is there another
> solution available?

This is what Session-Timers try to solve (and most of the times fails to
due to broken endpoint implementations IMHO).

The dialog module has a keep alive mechanism:
http://www.kamailio.org/docs/modules/stable/modules/dialog.html

Take a look at the ka_time/ka_interval/send_bye (and setting ka-src/dst).

Alternatively you could monitor this with an external script, kill
dialogs involving users that aren't registered (kind of braking SIP
since originating calls and registrations have nothing to do with
each other).