[Kamailio-Users] CDRTool and Prepaid

[Adrian Georgescu]

It does not require a b2bua. It can be done in the proxy call control  
module that send out the BYEs and the rating engine. Just the  
algorithm need to be defined.

--
Adrian

On Sep 5, 2008, at 11:05, Alex Balashov <abalashov at evaristesys.com>  
wrote:

> In my experience dealing with it, it is precisely at the point where  
> multiple calls are involved that using a proxy for rating and  
> mediation purely becomes an impossible headache.
>
> The conclusion I always came to in my implementations, which too  
> always started out with the noble goal of dealing with it all in  
> proxy, is that to properly handle this, I would need to extend the  
> functionality to include a B2BUA through which the calls are run  
> that can sit there and monitor them at a relatively low interval and  
> record updates to their duration into the database.
>
> The B2BUA would need some sort of call control API, like Asterisk's  
> Manager API, or whatever Yate has, so that an outside process can  
> sit there and do statekeeping on the calls.  You could do this  
> without handling media by using the B2BUA in a purely signaling  
> capacity, which I think is how Yate functions by default, and how  
> Asterisk can function with the "directrtpsetup" option in sip.conf.
>
> It is then possible to know in reasonably real time the call  
> duration without waiting for an accounting stop event and thus make  
> the determination of whether another call should be allowed given  
> the balance depletion.
>
> -- Alex
>
> Adrian Georgescu wrote:
>
>> The problem with concurrent prepaid calls and single balance is  
>> that  you have to correlate between the call control and rating  
>> angine  somehow so that all calls terminate when balnce becomes  
>> zero. The  problem is a bit complex:
>> Example:
>> Balance = 10.
>> A call starts to destination XXX, for the sake of example max  
>> session  time = 2 minutes
>> After one minute, you start second call to destination YYY which  
>> has a  different price and your balance is not anymore 10 but  
>> depends on the  duration of the first call which is in progress.
>> What is the maximum session time for it given that the first call  
>> is  already in progress?
>> What should happen with the first call?
>> I am looking for suggestions on implementing a proper algorithm to   
>> deal with this situation in the rating engine. If you have any I  
>> would  be glad to hear it.
>> Adrian
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>
>
> -- 
> Alex Balashov
> Evariste Systems
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