I-D Action:draft-rosenberg-dispatch-vipr-sip-antispam-03.txt

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	Title           : Session Initiation Protocol (SIP) Extensions for Blocking VoIP Spam Using PSTN Validation
	Author(s)       : J. Rosenberg, et al.
	Filename        : draft-rosenberg-dispatch-vipr-sip-antispam-03.txt
	Pages           : 9
	Date            : 2010-10-25

Verification Involving PSTN Reachability (ViPR) is a new technique
for inter-domain federation of SIP calls.  ViPR makes use of 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 technique for blocking spam - a SIP caller is only
authorized when its 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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