I-D ACTION:draft-froment-sipping-spit-requirements-01.txt

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	Title		: Requirements for Authorization Policies to tackle Spam and Unwanted Communication for Internet Telephony
	Author(s)	: T. Froment, et al.
	Filename	: draft-froment-sipping-spit-requirements-01.txt
	Pages		: 15
	Date		: 2007-7-11
	
Spam over Internet Telephony (SPIT) is one of the foreseen future
   forms of spamming that SIP open-wide networks may have to handle.
   SPIT also has more impact on users than email spam since it is more
   intrusive.  Email as a store-and-forward communication mechanism
   allows for several filtering mechanisms to be applied to the full
   content before being presented to the user.  Session Initiation
   Protocol (SIP) interaction is, in contrast, real-time communication
   and therefore does not provide much information prior to the
   transmission of the content, making it both harder to filter and more
   annoying to users.  The responsibility for filtering, blocking calls,
   or taking any other preventive action can belong to different
   elements in the call flow and may depend on various factors.

   This document discusses the requirements to define authorization
   policies that should allow end users or other parties to setup anti-
   SPIT policies for triggering these actions.  These policies typically
   match a particular SIP communication pattern based on a number of
   attributes.  The range of attributes includes information provided,
   for example, by the SIP protocol itself, by the SIP identity
   mechanism, by information carried within SAML assertions, reputation
   systems of social networks and other extensions.

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