[SR-Users] Dialog Module: How to get two different dialogues if a call is looped through kamailo (call forwarding scenario)

[Benoît Panizzon]

Hi Henning

Thank you for your help.

> Kamailio is not a B2BUA. So, the dialog module will only track the
> early dialog and then later update its to a "normal" dialog. After
> the end of the dialog the acc module will create the CDR, I think.
> Just to list some suggestions: 
> 
> - use a B2BUA (obviously)

Yes, obviously, but we would love to keep our voice platform simple. We
are switching away from a commercial solution supplier which turned out
to be very limited in flexibility and unable to solve obvious bugs to an
open source solution which we can extend matching our needs. So far very
happy with kamailio.

> - add some dialog variables to the CDR to track the call forwarding

I was thinking about that. I can successfully count the legs of a call
with:

        set_dlg_profile("legcounter","$ci");
        get_profile_size("legcounter","$ci","$var(legcounter)");
        xlog("L_INFO", "$cfg(route): DIALOGUE $ci Leg Counter: $var(legcounter)\n");

So I am indeed considering the possibility to embedd a CDR in a CDR by
adding information from each leg to a coma separated string which I
keep appending to a dlg_var for each leg.

Then in post-processing of the CDR I could extract that/those embedded
CDR and create a propper CDR for each legs.

But I am not sure about the lenght restriction of dlg_var and this
sound quite adventurous.

> - switch to transaction-based forwarding and have another component
> to generate CDRs from those records

Been there, attempted to catch all situation of call forwarding with
for example T.38 re-invites and fallbacks from the far side etc.
Yes it is looks somehow possible but extremely complicated to correctly
match all transaction and reply acc events. As I also need to count and
limit the number of concurrent calls per customer, we switched to
dialog.

> - of course also the modules could be extended, but this probably
> needs a bit more discussions

As kamailio is widely used by TSP. I guess I'm not the first facing
that requirement. So my hope was that I missed some module or way to
accomplish this.

-- 
Mit freundlichen Grüssen

-Benoît Panizzon- @ HomeOffice und normal erreichbar
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