%% You should probably cite draft-jennings-vipr-overview-06 instead of this revision.
@techreport{jennings-vipr-overview-05,
    number =    {draft-jennings-vipr-overview-05},
    type =      {Internet-Draft},
    institution =   {Internet Engineering Task Force},
    publisher = {Internet Engineering Task Force},
    note =      {Work in Progress},
    url =       {https://datatracker.ietf.org/doc/draft-jennings-vipr-overview/05/},
    author =    {Mary Barnes and Cullen Fluffy Jennings and Jonathan Rosenberg and Marc Petit-Huguenin},
    title =     {{Verification Involving PSTN Reachability: Requirements and Architecture Overview}},
    pagetotal = 30,
    year =      2013,
    month =     dec,
    day =       9,
    abstract =  {The Session Initiation Protocol (SIP) has seen widespread deployment within individual domains, typically supporting voice and video communications. Though it was designed from the outset to support inter-domain federation over the public Internet, such federation has not materialized. The primary reasons for this are the complexities of inter-domain phone number routing and concerns over security. This document reviews this problem space, outlines requirements, and then describes a model and technique for inter-domain federation with SIP involving the Public Switched Telephone Network (PSTN), called Verification Involving PSTN Reachability (VIPR). VIPR addresses the problems that have prevented inter-domain federation over the Internet. It provides fully distributed inter-domain routing for phone numbers, authorized mappings from phone numbers to domains, a new technique for automated SIP anti-spam, and privacy of number ownership, all while preserving the trapezoidal model of SIP.},
}