[SR-Users] How to increment dialog calee_cseq value when using t_uac_dlg via xmlrpc for generating INFO requests
Daniel-Constantin Mierla
miconda at gmail.com
Thu Sep 11 16:19:11 CEST 2014
Hello,
good to hear you found a solution. You can create a wiki page on our
project site if you want to share your experience, or if you write it in
your own site/blog, you can list it in the wiki as a link.
Cheers,
Daniel
On 11/09/14 13:06, Drazen Rep wrote:
> Hi,
>
> On Wed, Sep 10, 2014 at 2:46 PM, Drazen Rep wrote:
>
>
> > I am using Kamailio 4.1.1 and dlg_manage() function for
> processing SIP requests with dialog module. After call is
> established Kamailio is being used for generating in-dialog
> INFO request toward caller (using t_uac_dlg function via
> xmlrpc). INFO messages are correctly generated but dialog
> callee_cseq value is not being incremented with every message.
> That represents a problem since other SIP requests generated
> by callee side (like OPTIONS) are not in order, and there is
> no correct information about callee_cseq value in dialog
> memory records.
>
> >
> > The question is how can I increment dialog callee_cseq value
> when local INFO request toward caller is being generated using
> t_uac_dlg via xmlrpc?
>
> such feature is not available at this moment.
>
> If the callee hasn't sent yet a message, the proxy won't have
> any clue on what is going to be initial cseq used by callee,
> because there is no constraint to start from 1 in the SIP RFC.
>
>
> That is true, but my intention was anyway to intercept callee
> requests (i.e. OPTIONS and BYE) and alter CSeq: header values
> based on current dialog callee_cseq value if subsequent request is
> in-dialog ( if(is_known_dlg()) and if($ft==$dlg(to_tag)) ).
>
> Maybe I can use $dlg_var(key) variable for that purpose? It is not
> well documented so question would be when can I initialize it
> (i.e. right after dialog creation or only after subsequent
> request)? And of course how can I increment value of this variable
> when local INFO request toward caller is being generated using
> t_uac_dlg via xmlrpc? Is it possible to address this INFO request
> (created by tm module function) inside config file at all?
>
>
> Finally got this done via using 'event_route[tm:local-request]' and
> '$dlg_var(key)' variable for that dialog. It is working as expected.
> Will see if this approach brings new problem to solution.
>
> In the master branch (to become 4.2), I added recently support
> to increment the cseq towards caller, with the main target to
> handle authentication challenge from gateways/termination
> providers. In other words, dialog module has some capabilities
> towards handling cseq differences, but exactly what you need
> is not there.
>
>
> Had a quick look - great option, but indeed not what I need for
> this case.
>
> To get that, probably a new rpc command has to be exported by
> dialog module, to catch cseq updates, because t_uac_dlg is
> from tm module, with no relation to dialog. So, overall, it is
> about writing some c code to dialog module -- as starting
> point you can look at dlg_cseq.{c,h} files to see how cseq can
> be updated and eventually at dlg_bridge rpc command to see how
> a request within dialog can be sent (it sends a REFER withing
> dialog) or dlg terminate (which sends BYE).
>
>
> Thank you for the tip will take a look but unfortunately I am not
> a native C programmer.
>
> On the other hand, maybe there are other options for your
> needs, what is the purpose for INFO requests sent by the proxy?
>
>
> I am trying to build a proxy server which will send tariff
> information (AOC) toward IPphones/gateways (caller side) during
> the call via INFO messages with XML body.
>
> Thank you for your help,
>
> Drazen
>
>
>
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--
Daniel-Constantin Mierla
http://twitter.com/#!/miconda - http://www.linkedin.com/in/miconda
Next Kamailio Advanced Trainings 2014 - http://www.asipto.com
Sep 22-25, Berlin, Germany
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