[Serusers] [RFC] ideas about new dialog module

[Schliesser, Benson]

I'm thinking that the 'forceful termination' should have options for
redirection, i.e. to an announcements (or other media) server, etc. Is this
in line with your thoughts?

-Benson


> -----Original Message-----
> From: Maxim Sobolev [mailto:sobomax at portaone.com]
> Sent: Thursday, January 16, 2003 3:37 PM
> To: serusers at lists.iptel.org; kapitan at portaone.com
> Subject: [Serusers] [RFC] ideas about new dialog module
> 
> 
> Hi,
> 
> I am thinking about writing a new module for SER, which will track SIP
> dialogs and will serve as an abstraction layer for other modules, much
> like the tm module now. We need such module for 2 reasons:
> 
> 1. Call accounting. Our billing engine is based on the assumption that
> a node provides accounting information for completed calls, not for
> individual transactions. It is easier for us to extend proxy with
> similar features than to modify billing engine to do transaction
> matching.
> 
> 2. Debit card application. Currently, there is no way to use SER for
> debit card applications, where it is necessary to set the maximum
> duration of the call and terminate it forcefully if that duration is
> exceeded.
> 
> The raw idea is as follows:
> 
> - the module will register callbacks with tm.register_tmcb(), probably
> TMCB_REQUEST_IN and TMCB_REPLY_IN ones and will match INVITEs to BYEs
> keeping information about the state of ongoing sessions in the shared
> memory.
> 
> - the module will provide interested modules with ability to register
> several callbacks, i.e. on dialog creation/teardown and yet another
> callback on dialog timeouts (more about that below).
> 
> - the module will provide utility functions for forceful termination
> of any ongoing dialog.
> 
> - when invoking dialog creation callback function, the module will
> give the function opportunity to install a timer on that dialog, so
> that if the dialog is still active after timer expires, then some
> action is performed. For example, in the debit card applications, in
> such case the accounting module can decide to forcefully terminate a
> dialog.
> 
> What do you think?
> 
> -Maxim
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