[SR-Users] How to limit number of calls in Kamailio proxy

[Austin Einter]

Dear Andrew, Henning
Thanks for sharing very useful information.
I am bit new to kamailio, probably askingvery easy questions, please bear
with me.

I am not sure if I am forwording the INVITE statelessly or not.
How do I check if INVITE is forwarded statelessly.
Andrew you have mentioned 'So make sure that a transaction exists or create
it
explicitly using the tm module".

Not sure, how do I check if transaction exists or not. And how can I create
it.

Please give me some pointers or a sample config file.

Regards,
Austin


On Mon, Oct 31, 2011 at 4:37 PM, Andrew Pogrebennyk <
apogrebennyk at sipwise.com> wrote:

> Austin,
> That is strange, because I am using similar setup successfully. Actually
> I don't know if it counts the calls that are being established, I didn't
> care for it.
>
> While looking through the docs:
> http://kamailio.org/docs/modules/3.1.x/modules_k/dialog.html#id2524304
>  the following note caught my eye:
>
> IMPORTANT: Users of this function should make sure that the dialog
> created is further processed statefully. Specifically, if a stateless
> response is sent out after dlg_manage() is called, the dialog cannot be
> handled properly. So make sure that a transaction exists or create it
> explicitly using the tm module. This is a shortcoming of the current
> implementation that may be resolved in a future version hopefully.
>
> Could it be that you are forwarding the INVITE statelessly?
> Regards,
> Andrew
>
> On 10/30/2011 01:08 PM, Austin Einter wrote:
> > Thanks Andrew
> > I added profile_with_value module parameter and with that I am able to
> > overcome this error.
> >
> > My code looks as below.
> >
> >         dlg_manage();
> >         if (is_method("INVITE")) {
> >                  if (!has_totag()) {
> >                         #$var(SIZE) = 0;
> >                         get_profile_size("caller", "$fu", "$var(SIZE)");
> >                         xlog("Number of calls present now is
> > $var(SIZE)\n");
> >                         if( $var(SIZE) > MAX_NUMBER_OF_CALLS ) {
> >                                 sl_send_reply("503", "Simultaneous calls
> > limit reached");
> >                                 xlog("Rejected calls with 503
> > Simultaneous calls limit reached\n");
> >                                 exit;
> >                         }
> >                         else {
> >                                  xlog("Allowed call. Looks max calls
> > limit not reached. Calls= $var(SIZE)\n");
> >                         }
> >                         set_dlg_profile("caller","$fu");
> >                 }
> >         }
> > Whole purpose is to limit number of active calls at any point of time.
> > $var(SIZE) gives the number of calls are being established, but not the
> > number of calls are already established.
> >
> > So if I am making multiple calls at  a point of time, it is blocking
> > call attempts beyond limit. But after all call setup complete, again
> > $var(SIZE) becomes zero and allows new calls.
> >
> >
> > Has anybody done this (limiting number of calls at any point of time).
> > If so can you please share the configuration file changes.
> >
> >
> > To get $var(SIZE) working properly, do I need to enable MySql, please
> > advice.
> >
> > Regards
> > Austin
> >
>
>
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