[OpenSIPS-Devel] Sending INFO from MI

Alex Massover alex at jajah.com
Wed Sep 15 13:48:24 CEST 2010


Yes, that is a complication.

As far as I understand dialog module is able to handle CSeqs for both direction. The dirty workaround can be 'fix_dlg_seq()' function exported by dialog and to be called before forwarding request (maybe some flag can be turned on). 

For example, after loose_route():
if (is_dlg_flag_set("16")) {	// indicating that unidirectional request was locally generated, breaking cseq

Or a better solution is making TM aware of dialog and it can check cseqs automatically for every transaction.

-----Original Message-----
From: devel-bounces at lists.opensips.org [mailto:devel-bounces at lists.opensips.org] On Behalf Of Bogdan-Andrei Iancu
Sent: Wednesday, September 15, 2010 2:37 PM
To: OpenSIPS devel mailling list
Subject: Re: [OpenSIPS-Devel] Sending INFO from MI

Hi Alex,

As Ovidiu pointed out, this is not an easy one - if you generate a 
in-dialog request from the proxy, you will de-sync the cseq numbers 
between the 2 end-parties....So any change from the mid-proxy will imply 
the proxy to "fix" all the following cseq numbers in the following 
in-dialog requests (from the end parties).

With the BYE this is not a problem as after BYE there is not other 
"following in-dialog requests" ;)


Alex Massover wrote:
> Hi,
> I need to pass events generated by the external application during the 
> call. I'm thinking about to implement this with INFO.
> The idea is to add sending INFO functionality to the dialog module. In 
> analogy with 'dlg_end_dlg' MI function exported by dialog module, I 
> want to add 'dlg_send_info' function. That will receive 2 parameters:
> a) Direction (caller, callee, both) – to what side to send INFO
> b) Headers to add to INFO
> and eventually generate INFO request.
> What I'm trying to understand is how complex is to add such 
> functionality. Is the dialog module ready for such extension (I'll 
> look at how 'dlg_end_dlg' is implemented and do similar) or it will 
> require more advanced understanding and major changes to the module 
> design?
> --
> Best Regards,
> Alex Massover
> Telephony Group Manager
> R&D Department
> Jajah Inc.
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Bogdan-Andrei Iancu
OpenSIPS Bootcamp
20 - 24 September 2010, Frankfurt, Germany

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