I-D Action:draft-rosenberg-dispatch-vipr-sip-antispam-02.txt

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	Title           : Session Initiation Protocol (SIP) Extensions for Blocking VoIP Spam Using PSTN Validation
	Author(s)       : J. Rosenberg, C. Jennings
	Filename        : draft-rosenberg-dispatch-vipr-sip-antispam-02.txt
	Pages           : 8
	Date            : 2010-07-09

Verification Involving PSTN Reachability (ViPR) is a new technique
for inter-domain federation of SIP calls.  ViPR makes use of a the
PSTN as an introduction mechanism to verify the correctness of
mappings from phone numbers to domains.  The PSTN introduction
mechanism can also be used as a techqnique for blocking spam - a SIP
caller is only authorized when they're calling domain has previously
called that same number over the PSTN.  This document describes an
extension to SIP which enables authorization of SIP calls based on a
prior PSTN introduction.

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