[OpenSIPS-Devel] [NEW] exchanging info between dialogs

[Bogdan-Andrei Iancu]

Hi Richard,

So, a re-INVITE is part of the dialog and you can access all the data 
you originally stored in the dialog - BUT only AFTER doing loose_route() 
for that re-INVITE - check if you are doing it in the right order.

Regards,
Bogdan


Richard Revels wrote:
> I'm having a bit of a problem with this functionality and re-invites.  The call comes in, a dialog is created, a dialog flag is set, and a couple of values are stored in the dialog.  When the called party re-invites I want to look at those values so started trying with checking the dialog flag.  That came up empty so I decided that Opensips was thinking of this as a new dialog (hmm).  No big deal, I would use get_dialog_info.
>
> The if block around get_dialog_info never triggers and the debug log indicates the dialog is not found.
>
> Jun 12 22:40:38 guinea-pig2 osips-log[14664]: DBG:dialog:get_dlg_by_val: dlg in state 4 to check
> Jun 12 22:40:38 guinea-pig2 osips-log[14664]: DBG:dialog:w_get_dlg_info: no dialog found
>
> Since the dialog flag check works just fine in the BYE block, I decided to try the get_dialog_info there as well even though the current dialog would also be the one I was searching for.  It worked just fine using the same logic and values I am sending in from the re-invite block.
>
> Jun 12 23:14:13 guinea-pig2 osips-log[15011]: DBG:dialog:fetch_dlg_value: looking for <credit_user>
> Jun 12 23:14:13 guinea-pig2 osips-log[15011]: DBG:dialog:fetch_dlg_value: var found-> <9194395395>!
>
> Richard
>
>
> On Apr 28, 2010, at 11:46 AM, Bogdan-Andrei Iancu wrote:
>
>   
>> Hi,
>>
>> just added to the dialog module a new function that allow you to 
>> exchange data between dialogs - mainly to extract data from a different 
>> ongoing dialog.
>>
>> Such functionality is vital in complex scenarios (PBX related) like 
>> attended call transfer - in such cases you may want to route a new call 
>> based on information of existing dialogs.
>>
>> Real case example:
>>
>>    OpenSIPS is doing dispatching over a set of Asterisk boxes (which 
>> act as SIP servers).
>>    A calls B and the call is established (by dispatching from OpenSIPS) 
>> via A1 Asterisk server
>>    A wants to transfer B to a new party C, so A makes a new call to C 
>> -> this call must end on A1 also, without going via dispatcher in openSIPS.
>>    So, when A calls C, OpenSIPS will check if A has an already existing 
>> call and if so, it will send the new call to the same Asterisk box as 
>> the existing call.
>>
>> In such a case, for each call, you need to attached to the call (as 
>> dialog variables) the callee, caller and the Asterisk box . When a new 
>> call is coming, you check if the new caller is already involved in a 
>> call and if so, fetch the value of the proxy in order to send to the 
>> same box.
>>
>> For more about the technical details of the function, see
>>       http://www.opensips.org/html/docs/modules/devel/dialog.html#id272137
>>
>> Regards,
>> Bogdan
>>
>> -- 
>> Bogdan-Andrei Iancu
>> www.voice-system.ro
>>
>>
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>>     
>
>
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>   


-- 
Bogdan-Andrei Iancu
www.voice-system.ro