Verification Involving PSTN Reachability: The ViPR Access Protocol (VAP)

Document Type Expired Internet-Draft (individual)
Last updated 2012-09-06 (latest revision 2012-03-05)
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Verification Involving PSTN Reachability (ViPR) is a technique for inter-domain SIP federation. ViPR hybridizes the PSTN, P2P networks, and SIP, and in doing so, addresses the phone number routing and VoIP spam problems that have been a barrier to federation. The ViPR architecture uses a server, the ViPR server, which performs P2P and validation services on behalf of call agents, which acts as clients to the server. Such an architecture requires a client/server protocol between call agents and the ViPR server. That protocol, defined here, is called the ViPR Access Protocol (VAP).


Cullen Jennings (
Jonathan Rosenberg (
Marc Petit-Huguenin (

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