[SR-Users] Dialog / BYE

Timo Reimann sr at foo-lounge.de
Wed Nov 2 00:42:31 CET 2011


Hey Brandon,


Am 02.11.2011 um 00:32 schrieb Brandon Armstead:
>     Thats correct - however I am calling this before loose_route, perhaps that is my problem and need for calling dlg_get?  Let me give this a go - and I will respond back with my findings, thanks!

Yeah, that should be it -- linking to the currently active dialog is being implemented as a callback to record-routed messages which takes place after a call to loose_route().

Looking forward to hearing your findings. :)


Cheers,

--Timo



> On Tue, Nov 1, 2011 at 4:21 PM, Timo Reimann <sr at foo-lounge.de> wrote:
> Hey Brandon,
> 
> 
> Am 01.11.2011 um 23:44 schrieb Brandon Armstead:
> >     Thank you for the input - I actually just figured out a resolution.
> >
> > Apparently dlg_bye("all") must be called after dlg_get - so what I'm doing now is simply checking for request with a special request uri with the callid / from tag / to tag in the request that correlates to the call I desire to terminate.  I am then feeding $ci, $tt, and $ft into dlg_get and then calling dlg_bye("all") - in which Kamailio then proceeds to send BYE out to both legs of the call.
> >
> > I think we can mark this as resolved :).
> 
> OK, very good. :)
> 
> Let me make sure that this isn't a dialog module bug: You are now calling dlg_get() followed by dlg_bye() with proper parameters from within the Kamailio configuration script? if so, you shouldn't need to call dlg_get() in the first place, at least not if you place dlg_bye() after the call to loose_route(). Contrary, using certain dialog features (including dlg_bye()) from reply routes isn't completely possible yet which could explain your findings.
> 
> 
> Cheers,
> 
> --Timo
> 
> 
> 
> > On Tue, Nov 1, 2011 at 3:21 PM, Timo Reimann <sr at foo-lounge.de> wrote:
> > Hey Brandon,
> >
> >
> > Am 01.11.2011 um 22:48 schrieb Brandon Armstead:
> > >     I am attempting to tear down a call with a BYE packet generated externally (kind of similar to Kamailio fifo dlg_end_dlg).
> > >
> > > Let me describe what I am trying to do in more depth and then I will continue to tell you the problem I think I am experiencing.
> > >
> > > [PSTN SIP Proxy] -> [CORE SIP Proxy] -> [REGISTRAR] -> [UAC]
> > >
> > > So the above layout is the normal call flow / structure of calls (incoming when originating from pstn) (outgoing when originating from uac).
> > >
> > > I then have an "external" host - I am attempting to generate a BYE to [CORE SIP Proxy] and have it go both directions [PSTN] + [UAC].
> > >
> > > So far I am able to get the call to tear down in only a single direction (only kill call with PSTN) or (only kill call with UAC).
> > >
> > > I have not been able to kill both legs of the call.
> >
> > [snip]
> >
> >
> > > My Question - what am I doing wrong - or what is the best method to tackle this task?
> >
> > If I get you right you are trying to emulate Kamailio's dlg_end_dlg functionality without involving Kamailio at all (except for passing forward the BYE requests). This makes your question sort of off-topic as processing BYE requests is a matter of RFC 3261 alone.
> >
> > Apart from that, what you could do is take a look at the dialog module code and check how it implements dlg_end_dlg. An idea I have what you could possibly be doing wrong is not using the CSeq numbers that each party expects. I don't have the details at hand but if either CSeq number is off your UAs won't accept the BYE request.
> >
> >
> > Cheers,
> >
> > --Timo
> 




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