[SR-Users] provoke delay?

["Nicolas Rüger"]

Hi Alex,

NO that definitely NOT the motive!!!

I do write my master's thesis about SPIT prevention (SPAM over Internet Telephony) and I try to implement several ideas in kamailio to detect SIP-URI's that try to "spit".

So don't worry...I won't use your help to do illegal stuff! Hope that's clarified.

Amongst other ideas I try to implement a functionality that matches a suspicios caller's identity on a list in the database. 

Afterwards the caller is either rejected or delayed, depending on his reputation that I compute before using other ideas.

I want to delay some of these suspicios calls instead of rejecting them completly as rejecting a call is really hard. 

Further I expect automatically initiated calls to have a timeout. If the "spitting" party won't get an answer fast enough it might walk on and try another IP.

The idea is indeed adapted from the "e-mail world".

Regards,

Nicolas




-------- Original-Nachricht --------
> Datum: Tue, 26 Oct 2010 11:47:52 -0400
> Von: Alex Balashov <abalashov at evaristesys.com>
> An: sr-users at lists.sip-router.org
> Betreff: Re: [SR-Users] provoke delay?

> I get this question a lot privately from people who want to play games 
> to pad out the billable time in a call by sitting on it for a while 
> before passing it up to their vendors/upstreams.
> 
> If by chance that is the real motive, don't do it.  :-)  It's far more 
> trouble than it's worth.
> 
> -- 
> Alex Balashov - Principal
> Evariste Systems LLC
> 1170 Peachtree Street
> 12th Floor, Suite 1200
> Atlanta, GA 30309
> Tel: +1-678-954-0670
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> Web: http://www.evaristesys.com/
> 
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