A Document Format for Expressing Authorization Policies to tackle Spam and Unwanted Communication for Internet Telephony

Document Type Expired Internet-Draft (individual)
Authors Hannes Tschofenig  , Dan Wing  , Henning Schulzrinne  , Thomas Froment  , Geoffrey Dawirs 
Last updated 2008-07-12
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


SPAM, defined as sending unsolicited messages to someone in bulk, might be a problem on SIP open-wide deployed networks. The responsibility for filtering or blocking calls can belong to different elements in the call flow and may depend on various factors. This document defines an authorization based policy language that allows end users to upload anti-SPIT policies to intermediaries, such as SIP proxies. These policies mitigate unwanted SIP communications. It extends the Common Policy authorization framework with additional conditions and actions. The new conditions match a particular Session Initiation Protocol (SIP) communication pattern based on a number of attributes. The range of attributes includes information provided, for example, by SIP itself, by the SIP identity mechanism, by information carried within SAML assertions.


Hannes Tschofenig (Hannes.Tschofenig@gmx.net)
Dan Wing (dwing@cisco.com)
Henning Schulzrinne (hgs@cs.columbia.edu)
Thomas Froment (Thomas.Froment@alcatel-lucent.fr)
Geoffrey Dawirs (gdawirs@gdawirs.be)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)